diff --git a/schema/alert.go b/schema/alert.go
index b21e00b..a4e217a 100644
--- a/schema/alert.go
+++ b/schema/alert.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
@@ -56,6 +57,11 @@ type Alert struct {
 
 	
 	
+		Fp_hists *UnionNullArrayFp_hist
+	
+
+	
+	
 		CutoutScience *UnionNullCutout
 	
 
@@ -71,7 +77,7 @@ type Alert struct {
 
 }
 
-const AlertAvroCRC64Fingerprint = "\xb0\x9f;,H\xc2\xdc\r"
+const AlertAvroCRC64Fingerprint = "\xbc\x10\x1b\v＂B"
 
 func NewAlert() (*Alert) {
 	return &Alert{}
@@ -139,6 +145,11 @@ func writeAlert(r *Alert, w io.Writer) error {
 		return err
 	}
 	
+	err = writeUnionNullArrayFp_hist( r.Fp_hists, w)
+	if err != nil {
+		return err
+	}
+	
 	err = writeUnionNullCutout( r.CutoutScience, w)
 	if err != nil {
 		return err
@@ -162,7 +173,7 @@ func (r *Alert) Serialize(w io.Writer) error {
 }
 
 func (r *Alert) Schema() string {
-	return "{\"doc\":\"avro alert schema for ZTF (www.ztf.caltech.edu)\",\"fields\":[{\"doc\":\"schema version used\",\"name\":\"schemavsn\",\"type\":\"string\"},{\"doc\":\"origin of alert packet\",\"name\":\"publisher\",\"type\":\"string\"},{\"doc\":\"object identifier or name\",\"name\":\"objectId\",\"type\":\"string\"},{\"name\":\"candid\",\"type\":\"long\"},{\"name\":\"candidate\",\"type\":{\"doc\":\"avro alert schema\",\"fields\":[{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for science image to facilitate archive retrieval\",\"name\":\"pid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"filename of positive (sci minus ref) difference image\",\"name\":\"pdiffimfilename\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Principal investigator attached to program ID\",\"name\":\"programpi\",\"type\":[\"null\",\"string\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Candidate ID from operations DB\",\"name\":\"candid\",\"type\":\"long\"},{\"doc\":\"t or 1 =\\u003e candidate is from positive (sci minus ref) subtraction; f or 0 =\\u003e candidate is from negative (ref minus sci) subtraction\",\"name\":\"isdiffpos\",\"type\":\"string\"},{\"default\":null,\"doc\":\"Internal pipeline table extraction ID\",\"name\":\"tblid\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Night ID\",\"name\":\"nid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"x-image position of candidate [pixels]\",\"name\":\"xpos\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"y-image position of candidate [pixels]\",\"name\":\"ypos\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of candidate; J2000 [deg]\",\"name\":\"ra\",\"type\":\"double\"},{\"doc\":\"Declination of candidate; J2000 [deg]\",\"name\":\"dec\",\"type\":\"double\"},{\"doc\":\"Magnitude from PSF-fit photometry [mag]\",\"name\":\"magpsf\",\"type\":\"float\"},{\"doc\":\"1-sigma uncertainty in magpsf [mag]\",\"name\":\"sigmapsf\",\"type\":\"float\"},{\"default\":null,\"doc\":\"Reduced chi-square for PSF-fit\",\"name\":\"chipsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 14 pixel diameter aperture [mag]\",\"name\":\"magap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magap [mag]\",\"name\":\"sigmagap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [pixels]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Local sky background estimate [DN]\",\"name\":\"sky\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: magap - magpsf [mag]\",\"name\":\"magdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]\",\"name\":\"fwhm\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy classification score from SExtractor\",\"name\":\"classtar\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to nearest edge in image [pixels]\",\"name\":\"mindtoedge\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: diffmaglim - magap [mag]\",\"name\":\"magfromlim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: difffwhm / fwhm\",\"name\":\"seeratio\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat major axis from SExtractor [pixels]\",\"name\":\"aimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat minor axis from SExtractor [pixels]\",\"name\":\"bimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / fwhm\",\"name\":\"aimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: bimage / fwhm\",\"name\":\"bimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / bimage\",\"name\":\"elong\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"number of negative pixels in a 5 x 5 pixel stamp\",\"name\":\"nneg\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"number of prior-tagged bad pixels in a 5 x 5 pixel stamp\",\"name\":\"nbad\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"RealBogus quality score from Random Forest classifier; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"rb\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest known solar system object if exists within 30 arcsec [arcsec]\",\"name\":\"ssdistnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]\",\"name\":\"ssmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"name of nearest known solar system object if exists within 30 arcsec (from MPC archive)\",\"name\":\"ssnamenr\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers\",\"name\":\"sumrat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 18 pixel diameter aperture [mag]\",\"name\":\"magapbig\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magapbig [mag]\",\"name\":\"sigmagapbig\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":\"double\"},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":\"double\"},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr1\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of spatially-coincident detections falling within 1.5 arcsec going back to beginning of survey; only detections that fell on the same field and readout-channel ID where the input candidate was observed are counted\",\"name\":\"ndethist\",\"type\":\"int\"},{\"doc\":\"Number of times input candidate position fell on any field and readout-channel going back to beginning of survey\",\"name\":\"ncovhist\",\"type\":\"int\"},{\"default\":null,\"doc\":\"Earliest Julian date of epoch corresponding to ndethist [days]\",\"name\":\"jdstarthist\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Latest Julian date of epoch corresponding to ndethist [days]\",\"name\":\"jdendhist\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Peak-pixel signal-to-noise ratio in point source matched-filtered detection image\",\"name\":\"scorr\",\"type\":[\"null\",\"double\"]},{\"default\":0,\"doc\":\"1 =\\u003e candidate is from a Target-of-Opportunity (ToO) exposure; 0 =\\u003e candidate is from a non-ToO exposure\",\"name\":\"tooflag\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Object ID of closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps1\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Object ID of second closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps2\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of second closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to second closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Object ID of third closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps3\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of third closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to third closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr3\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of source matches from PS1 catalog falling within 30 arcsec\",\"name\":\"nmtchps\",\"type\":\"int\"},{\"doc\":\"Processing ID for reference image to facilitate archive retrieval\",\"name\":\"rfid\",\"type\":\"long\"},{\"doc\":\"Observation Julian date of earliest exposure used to generate reference image [days]\",\"name\":\"jdstartref\",\"type\":\"double\"},{\"doc\":\"Observation Julian date of latest exposure used to generate reference image [days]\",\"name\":\"jdendref\",\"type\":\"double\"},{\"doc\":\"Number of frames (epochal images) used to generate reference image\",\"name\":\"nframesref\",\"type\":\"int\"},{\"doc\":\"version of Random Forest classifier model used to assign RealBogus (rb) quality score\",\"name\":\"rbversion\",\"type\":\"string\"},{\"default\":null,\"doc\":\"Ratio: D/stddev(D) on event position where D = difference image\",\"name\":\"dsnrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: S/stddev(S) on event position where S = image of convolution: D (x) PSF(D)\",\"name\":\"ssnrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference of statistics: dsnrms - ssnrms\",\"name\":\"dsdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of PS1 photometric calibrators used to calibrate science image from science image processing\",\"name\":\"nmatches\",\"type\":\"int\"},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Covariance in magzpsci and clrcoeff from science image processing [mag^2]\",\"name\":\"zpclrcov\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point from median of all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"zpmed\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Median color of all PS1 photometric calibrators used from science image processing [mag]: for filter (fid) = 1, 2, 3, PS1 color used = g-r, g-r, r-i respectively\",\"name\":\"clrmed\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS color (deviation from average) of all PS1 photometric calibrators used from science image processing [mag]\",\"name\":\"clrrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [arcsec]\",\"name\":\"neargaia\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [arcsec]\",\"name\":\"neargaiabright\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Gaia (G-band) magnitude of closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [mag]\",\"name\":\"maggaia\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Gaia (G-band) magnitude of closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [mag]\",\"name\":\"maggaiabright\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Integration time of camera exposure [sec]\",\"name\":\"exptime\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RealBogus quality score from Deep-Learning-based classifier; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"drb\",\"type\":[\"null\",\"float\"]},{\"doc\":\"version of Deep-Learning-based classifier model used to assign RealBogus (drb) quality score\",\"name\":\"drbversion\",\"type\":\"string\"}],\"name\":\"candidate\",\"namespace\":\"ztf.alert\",\"type\":\"record\",\"version\":\"3.3\"}},{\"default\":null,\"name\":\"prv_candidates\",\"type\":[\"null\",{\"items\":{\"doc\":\"avro alert schema\",\"fields\":[{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for image\",\"name\":\"pid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"filename of positive (sci minus ref) difference image\",\"name\":\"pdiffimfilename\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Principal investigator attached to program ID\",\"name\":\"programpi\",\"type\":[\"null\",\"string\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Candidate ID from operations DB\",\"name\":\"candid\",\"type\":[\"null\",\"long\"]},{\"doc\":\"t or 1 =\\u003e candidate is from positive (sci minus ref) subtraction; f or 0 =\\u003e candidate is from negative (ref minus sci) subtraction\",\"name\":\"isdiffpos\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Internal pipeline table extraction ID\",\"name\":\"tblid\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Night ID\",\"name\":\"nid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"x-image position of candidate [pixels]\",\"name\":\"xpos\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"y-image position of candidate [pixels]\",\"name\":\"ypos\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of candidate; J2000 [deg]\",\"name\":\"ra\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Declination of candidate; J2000 [deg]\",\"name\":\"dec\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Magnitude from PSF-fit photometry [mag]\",\"name\":\"magpsf\",\"type\":[\"null\",\"float\"]},{\"doc\":\"1-sigma uncertainty in magpsf [mag]\",\"name\":\"sigmapsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Reduced chi-square for PSF-fit\",\"name\":\"chipsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 14 pixel diameter aperture [mag]\",\"name\":\"magap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magap [mag]\",\"name\":\"sigmagap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [pixels]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Local sky background estimate [DN]\",\"name\":\"sky\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: magap - magpsf [mag]\",\"name\":\"magdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]\",\"name\":\"fwhm\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy classification score from SExtractor\",\"name\":\"classtar\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to nearest edge in image [pixels]\",\"name\":\"mindtoedge\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: diffmaglim - magap [mag]\",\"name\":\"magfromlim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: difffwhm / fwhm\",\"name\":\"seeratio\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat major axis from SExtractor [pixels]\",\"name\":\"aimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat minor axis from SExtractor [pixels]\",\"name\":\"bimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / fwhm\",\"name\":\"aimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: bimage / fwhm\",\"name\":\"bimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / bimage\",\"name\":\"elong\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"number of negative pixels in a 5 x 5 pixel stamp\",\"name\":\"nneg\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"number of prior-tagged bad pixels in a 5 x 5 pixel stamp\",\"name\":\"nbad\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"RealBogus quality score; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"rb\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest known solar system object if exists within 30 arcsec [arcsec]\",\"name\":\"ssdistnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]\",\"name\":\"ssmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"name of nearest known solar system object if exists within 30 arcsec (from MPC archive)\",\"name\":\"ssnamenr\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers\",\"name\":\"sumrat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 18 pixel diameter aperture [mag]\",\"name\":\"magapbig\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magapbig [mag]\",\"name\":\"sigmagapbig\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Peak-pixel signal-to-noise ratio in point source matched-filtered detection image\",\"name\":\"scorr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"doc\":\"version of RealBogus model/classifier used to assign rb quality score\",\"name\":\"rbversion\",\"type\":\"string\"}],\"name\":\"prv_candidate\",\"namespace\":\"ztf.alert\",\"type\":\"record\",\"version\":\"3.3\"},\"type\":\"array\"}]},{\"default\":null,\"name\":\"cutoutScience\",\"type\":[\"null\",{\"doc\":\"avro alert schema\",\"fields\":[{\"name\":\"fileName\",\"type\":\"string\"},{\"doc\":\"fits.gz\",\"name\":\"stampData\",\"type\":\"bytes\"}],\"name\":\"cutout\",\"namespace\":\"ztf.alert\",\"type\":\"record\",\"version\":\"3.3\"}]},{\"default\":null,\"name\":\"cutoutTemplate\",\"type\":[\"null\",\"ztf.alert.cutout\"]},{\"default\":null,\"name\":\"cutoutDifference\",\"type\":[\"null\",\"ztf.alert.cutout\"]}],\"name\":\"ztf.alert\",\"type\":\"record\",\"version\":\"3.3\"}"
+	return "{\"doc\":\"avro alert schema for ZTF (www.ztf.caltech.edu)\",\"fields\":[{\"doc\":\"schema version used\",\"name\":\"schemavsn\",\"type\":\"string\"},{\"doc\":\"origin of alert packet\",\"name\":\"publisher\",\"type\":\"string\"},{\"doc\":\"object identifier or name\",\"name\":\"objectId\",\"type\":\"string\"},{\"name\":\"candid\",\"type\":\"long\"},{\"name\":\"candidate\",\"type\":{\"doc\":\"avro alert schema\",\"fields\":[{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for science image to facilitate archive retrieval\",\"name\":\"pid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"filename of positive (sci minus ref) difference image\",\"name\":\"pdiffimfilename\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Principal investigator attached to program ID\",\"name\":\"programpi\",\"type\":[\"null\",\"string\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Candidate ID from operations DB\",\"name\":\"candid\",\"type\":\"long\"},{\"doc\":\"t or 1 =\\u003e candidate is from positive (sci minus ref) subtraction; f or 0 =\\u003e candidate is from negative (ref minus sci) subtraction\",\"name\":\"isdiffpos\",\"type\":\"string\"},{\"default\":null,\"doc\":\"Internal pipeline table extraction ID\",\"name\":\"tblid\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Night ID\",\"name\":\"nid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"x-image position of candidate [pixels]\",\"name\":\"xpos\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"y-image position of candidate [pixels]\",\"name\":\"ypos\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of candidate; J2000 [deg]\",\"name\":\"ra\",\"type\":\"double\"},{\"doc\":\"Declination of candidate; J2000 [deg]\",\"name\":\"dec\",\"type\":\"double\"},{\"doc\":\"Magnitude from PSF-fit photometry [mag]\",\"name\":\"magpsf\",\"type\":\"float\"},{\"doc\":\"1-sigma uncertainty in magpsf [mag]\",\"name\":\"sigmapsf\",\"type\":\"float\"},{\"default\":null,\"doc\":\"Reduced chi-square for PSF-fit\",\"name\":\"chipsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 14 pixel diameter aperture [mag]\",\"name\":\"magap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magap [mag]\",\"name\":\"sigmagap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [pixels]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Local sky background estimate [DN]\",\"name\":\"sky\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: magap - magpsf [mag]\",\"name\":\"magdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]\",\"name\":\"fwhm\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy classification score from SExtractor\",\"name\":\"classtar\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to nearest edge in image [pixels]\",\"name\":\"mindtoedge\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: diffmaglim - magap [mag]\",\"name\":\"magfromlim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: difffwhm / fwhm\",\"name\":\"seeratio\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat major axis from SExtractor [pixels]\",\"name\":\"aimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat minor axis from SExtractor [pixels]\",\"name\":\"bimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / fwhm\",\"name\":\"aimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: bimage / fwhm\",\"name\":\"bimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / bimage\",\"name\":\"elong\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"number of negative pixels in a 5 x 5 pixel stamp\",\"name\":\"nneg\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"number of prior-tagged bad pixels in a 5 x 5 pixel stamp\",\"name\":\"nbad\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"RealBogus quality score from Random Forest classifier; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"rb\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest known solar system object if exists within 30 arcsec [arcsec]\",\"name\":\"ssdistnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]\",\"name\":\"ssmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"name of nearest known solar system object if exists within 30 arcsec (from MPC archive)\",\"name\":\"ssnamenr\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers\",\"name\":\"sumrat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 18 pixel diameter aperture [mag]\",\"name\":\"magapbig\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magapbig [mag]\",\"name\":\"sigmagapbig\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":\"double\"},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":\"double\"},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr1\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of spatially-coincident detections falling within 1.5 arcsec going back to beginning of survey; only detections that fell on the same field and readout-channel ID where the input candidate was observed are counted. All raw detections down to a photometric S/N of ~ 3 are included.\",\"name\":\"ndethist\",\"type\":\"int\"},{\"doc\":\"Number of times input candidate position fell on any field and readout-channel going back to beginning of survey\",\"name\":\"ncovhist\",\"type\":\"int\"},{\"default\":null,\"doc\":\"Earliest Julian date of epoch corresponding to ndethist [days]\",\"name\":\"jdstarthist\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Latest Julian date of epoch corresponding to ndethist [days]\",\"name\":\"jdendhist\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Peak-pixel signal-to-noise ratio in point source matched-filtered detection image\",\"name\":\"scorr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"1 =\\u003e candidate is from a Target-of-Opportunity (ToO) exposure; 0 =\\u003e candidate is from a non-ToO exposure\",\"name\":\"tooflag\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Object ID of closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps1\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Object ID of second closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps2\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of second closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to second closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Object ID of third closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps3\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of third closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to third closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr3\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of source matches from PS1 catalog falling within 30 arcsec\",\"name\":\"nmtchps\",\"type\":\"int\"},{\"doc\":\"Processing ID for reference image to facilitate archive retrieval\",\"name\":\"rfid\",\"type\":\"long\"},{\"doc\":\"Observation Julian date of earliest exposure used to generate reference image [days]\",\"name\":\"jdstartref\",\"type\":\"double\"},{\"doc\":\"Observation Julian date of latest exposure used to generate reference image [days]\",\"name\":\"jdendref\",\"type\":\"double\"},{\"doc\":\"Number of frames (epochal images) used to generate reference image\",\"name\":\"nframesref\",\"type\":\"int\"},{\"doc\":\"version of Random Forest classifier model used to assign RealBogus (rb) quality score\",\"name\":\"rbversion\",\"type\":\"string\"},{\"default\":null,\"doc\":\"Ratio: D/stddev(D) on event position where D = difference image\",\"name\":\"dsnrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: S/stddev(S) on event position where S = image of convolution: D (x) PSF(D)\",\"name\":\"ssnrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference of statistics: dsnrms - ssnrms\",\"name\":\"dsdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of PS1 photometric calibrators used to calibrate science image from science image processing\",\"name\":\"nmatches\",\"type\":\"int\"},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Covariance in magzpsci and clrcoeff from science image processing [mag^2]\",\"name\":\"zpclrcov\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point from median of all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"zpmed\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Median color of all PS1 photometric calibrators used from science image processing [mag]: for filter (fid) = 1, 2, 3, PS1 color used = g-r, g-r, r-i respectively\",\"name\":\"clrmed\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS color (deviation from average) of all PS1 photometric calibrators used from science image processing [mag]\",\"name\":\"clrrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [arcsec]\",\"name\":\"neargaia\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [arcsec]\",\"name\":\"neargaiabright\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Gaia (G-band) magnitude of closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [mag]\",\"name\":\"maggaia\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Gaia (G-band) magnitude of closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [mag]\",\"name\":\"maggaiabright\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Integration time of camera exposure [sec]\",\"name\":\"exptime\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RealBogus quality score from Deep-Learning-based classifier; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"drb\",\"type\":[\"null\",\"float\"]},{\"doc\":\"version of Deep-Learning-based classifier model used to assign RealBogus (drb) quality score\",\"name\":\"drbversion\",\"type\":\"string\"}],\"name\":\"candidate\",\"namespace\":\"ztf.alert\",\"type\":\"record\",\"version\":\"4.02\"}},{\"default\":null,\"name\":\"prv_candidates\",\"type\":[\"null\",{\"items\":{\"doc\":\"avro alert schema\",\"fields\":[{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for image\",\"name\":\"pid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"filename of positive (sci minus ref) difference image\",\"name\":\"pdiffimfilename\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Principal investigator attached to program ID\",\"name\":\"programpi\",\"type\":[\"null\",\"string\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Candidate ID from operations DB\",\"name\":\"candid\",\"type\":[\"null\",\"long\"]},{\"doc\":\"t or 1 =\\u003e candidate is from positive (sci minus ref) subtraction; f or 0 =\\u003e candidate is from negative (ref minus sci) subtraction\",\"name\":\"isdiffpos\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Internal pipeline table extraction ID\",\"name\":\"tblid\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Night ID\",\"name\":\"nid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"x-image position of candidate [pixels]\",\"name\":\"xpos\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"y-image position of candidate [pixels]\",\"name\":\"ypos\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of candidate; J2000 [deg]\",\"name\":\"ra\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Declination of candidate; J2000 [deg]\",\"name\":\"dec\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Magnitude from PSF-fit photometry [mag]\",\"name\":\"magpsf\",\"type\":[\"null\",\"float\"]},{\"doc\":\"1-sigma uncertainty in magpsf [mag]\",\"name\":\"sigmapsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Reduced chi-square for PSF-fit\",\"name\":\"chipsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 14 pixel diameter aperture [mag]\",\"name\":\"magap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magap [mag]\",\"name\":\"sigmagap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [pixels]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Local sky background estimate [DN]\",\"name\":\"sky\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: magap - magpsf [mag]\",\"name\":\"magdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]\",\"name\":\"fwhm\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy classification score from SExtractor\",\"name\":\"classtar\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to nearest edge in image [pixels]\",\"name\":\"mindtoedge\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: diffmaglim - magap [mag]\",\"name\":\"magfromlim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: difffwhm / fwhm\",\"name\":\"seeratio\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat major axis from SExtractor [pixels]\",\"name\":\"aimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat minor axis from SExtractor [pixels]\",\"name\":\"bimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / fwhm\",\"name\":\"aimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: bimage / fwhm\",\"name\":\"bimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / bimage\",\"name\":\"elong\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"number of negative pixels in a 5 x 5 pixel stamp\",\"name\":\"nneg\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"number of prior-tagged bad pixels in a 5 x 5 pixel stamp\",\"name\":\"nbad\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"RealBogus quality score; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"rb\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest known solar system object if exists within 30 arcsec [arcsec]\",\"name\":\"ssdistnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]\",\"name\":\"ssmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"name of nearest known solar system object if exists within 30 arcsec (from MPC archive)\",\"name\":\"ssnamenr\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers\",\"name\":\"sumrat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 18 pixel diameter aperture [mag]\",\"name\":\"magapbig\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magapbig [mag]\",\"name\":\"sigmagapbig\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Peak-pixel signal-to-noise ratio in point source matched-filtered detection image\",\"name\":\"scorr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"doc\":\"version of RealBogus model/classifier used to assign rb quality score\",\"name\":\"rbversion\",\"type\":\"string\"}],\"name\":\"prv_candidate\",\"namespace\":\"ztf.alert\",\"type\":\"record\",\"version\":\"4.02\"},\"type\":\"array\"}]},{\"default\":null,\"name\":\"fp_hists\",\"type\":[\"null\",{\"items\":{\"doc\":\"avro alert schema\",\"fields\":[{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for image\",\"name\":\"pid\",\"type\":\"long\"},{\"doc\":\"Processing ID for reference image to facilitate archive retrieval\",\"name\":\"rfid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Effective FWHM of sci image [pixels]\",\"name\":\"sciinpseeing\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Background level in sci image [DN]\",\"name\":\"scibckgnd\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Robust sigma per pixel in sci image [DN]\",\"name\":\"scisigpix\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Integration time of camera exposure [sec]\",\"name\":\"exptime\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full sci image astrometric RMS along R.A. with respect to Gaia1 [arcsec]\",\"name\":\"adpctdif1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full sci image astrometric RMS along Dec. with respect to Gaia1 [arcsec]\",\"name\":\"adpctdif2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"default\":null,\"doc\":\"Forced difference image PSF-fit flux [DN]\",\"name\":\"forcediffimflux\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in forcediffimflux [DN]\",\"name\":\"forcediffimfluxunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Forced photometry processing status codes (0 =\\u003e no warnings); see documentation\",\"name\":\"procstatus\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [arcsec]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":\"double\"},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":\"double\"},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]}],\"name\":\"fp_hist\",\"namespace\":\"ztf.alert\",\"type\":\"record\",\"version\":\"4.02\"},\"type\":\"array\"}]},{\"default\":null,\"name\":\"cutoutScience\",\"type\":[\"null\",{\"doc\":\"avro alert schema\",\"fields\":[{\"name\":\"fileName\",\"type\":\"string\"},{\"doc\":\"fits.gz\",\"name\":\"stampData\",\"type\":\"bytes\"}],\"name\":\"cutout\",\"namespace\":\"ztf.alert\",\"type\":\"record\",\"version\":\"4.02\"}]},{\"default\":null,\"name\":\"cutoutTemplate\",\"type\":[\"null\",\"ztf.alert.cutout\"]},{\"default\":null,\"name\":\"cutoutDifference\",\"type\":[\"null\",\"ztf.alert.cutout\"]}],\"name\":\"ztf.alert\",\"type\":\"record\",\"version\":\"4.02\"}"
 }
 
 func (r *Alert) SchemaName() string {
@@ -225,6 +236,15 @@ func (r *Alert) Get(i int) types.Field {
 	
 	case 6:
 		
+			r.Fp_hists = NewUnionNullArrayFp_hist()
+
+		
+		
+			return r.Fp_hists
+		
+	
+	case 7:
+		
 			r.CutoutScience = NewUnionNullCutout()
 
 		
@@ -232,7 +252,7 @@ func (r *Alert) Get(i int) types.Field {
 			return r.CutoutScience
 		
 	
-	case 7:
+	case 8:
 		
 			r.CutoutTemplate = NewUnionNullCutout()
 
@@ -241,7 +261,7 @@ func (r *Alert) Get(i int) types.Field {
 			return r.CutoutTemplate
 		
 	
-	case 8:
+	case 9:
 		
 			r.CutoutDifference = NewUnionNullCutout()
 
@@ -276,20 +296,27 @@ func (r *Alert) SetDefault(i int) {
 	
         
 	case 6:
-       	 	r.CutoutScience = NewUnionNullCutout()
+       	 	r.Fp_hists = NewUnionNullArrayFp_hist()
 
 		return
 	
 	
         
 	case 7:
-       	 	r.CutoutTemplate = NewUnionNullCutout()
+       	 	r.CutoutScience = NewUnionNullCutout()
 
 		return
 	
 	
         
 	case 8:
+       	 	r.CutoutTemplate = NewUnionNullCutout()
+
+		return
+	
+	
+        
+	case 9:
        	 	r.CutoutDifference = NewUnionNullCutout()
 
 		return
diff --git a/schema/alert_container.go b/schema/alert_container.go
index ac0ce02..00906bd 100644
--- a/schema/alert_container.go
+++ b/schema/alert_container.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/array_fp_hist.go b/schema/array_fp_hist.go
new file mode 100644
index 0000000..8bc198e
--- /dev/null
+++ b/schema/array_fp_hist.go
@@ -0,0 +1,59 @@
+// Code generated by github.com/actgardner/gogen-avro. DO NOT EDIT.
+/*
+ * SOURCES:
+ *     alert.avsc
+ *     candidate.avsc
+ *     cutout.avsc
+ *     fp_hist.avsc
+ *     prv_candidate.avsc
+ */
+package schema
+
+import (
+	"io"
+
+	"github.com/actgardner/gogen-avro/vm/types"
+	"github.com/actgardner/gogen-avro/vm"
+)
+
+func writeArrayFp_hist(r []*Fp_hist, w io.Writer) error {
+	err := vm.WriteLong(int64(len(r)),w)
+	if err != nil || len(r) == 0 {
+		return err
+	}
+	for _, e := range r {
+		err = writeFp_hist(e, w)
+		if err != nil {
+			return err
+		}
+	}
+	return vm.WriteLong(0,w)
+}
+
+
+
+type ArrayFp_histWrapper []*Fp_hist
+
+func (_ *ArrayFp_histWrapper) SetBoolean(v bool) { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) SetInt(v int32) { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) SetLong(v int64) { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) SetFloat(v float32) { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) SetDouble(v float64) { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) SetBytes(v []byte) { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) SetString(v string) { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) SetUnionElem(v int64) { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) Get(i int) types.Field { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) AppendMap(key string) types.Field { panic("Unsupported operation") }
+func (_ *ArrayFp_histWrapper) Finalize() { }
+func (_ *ArrayFp_histWrapper) SetDefault(i int) { panic("Unsupported operation") }
+func (r *ArrayFp_histWrapper) AppendArray() types.Field {
+	var v *Fp_hist
+	
+	v = NewFp_hist()
+
+ 	
+	*r = append(*r, v)
+        
+        return (*r)[len(*r)-1]
+        
+}
diff --git a/schema/array_prv_candidate.go b/schema/array_prv_candidate.go
index bf6c288..4c85b4f 100644
--- a/schema/array_prv_candidate.go
+++ b/schema/array_prv_candidate.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/candidate.go b/schema/candidate.go
index 91bf328..8904432 100644
--- a/schema/candidate.go
+++ b/schema/candidate.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
@@ -411,7 +412,7 @@ type Candidate struct {
 	
 
 	
-	// Number of spatially-coincident detections falling within 1.5 arcsec going back to beginning of survey; only detections that fell on the same field and readout-channel ID where the input candidate was observed are counted
+	// Number of spatially-coincident detections falling within 1.5 arcsec going back to beginning of survey; only detections that fell on the same field and readout-channel ID where the input candidate was observed are counted. All raw detections down to a photometric S/N of ~ 3 are included.
 	
 	
 		Ndethist int32
@@ -1302,7 +1303,7 @@ func (r *Candidate) Serialize(w io.Writer) error {
 }
 
 func (r *Candidate) Schema() string {
-	return "{\"doc\":\"avro alert schema\",\"fields\":[{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for science image to facilitate archive retrieval\",\"name\":\"pid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"filename of positive (sci minus ref) difference image\",\"name\":\"pdiffimfilename\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Principal investigator attached to program ID\",\"name\":\"programpi\",\"type\":[\"null\",\"string\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Candidate ID from operations DB\",\"name\":\"candid\",\"type\":\"long\"},{\"doc\":\"t or 1 =\\u003e candidate is from positive (sci minus ref) subtraction; f or 0 =\\u003e candidate is from negative (ref minus sci) subtraction\",\"name\":\"isdiffpos\",\"type\":\"string\"},{\"default\":null,\"doc\":\"Internal pipeline table extraction ID\",\"name\":\"tblid\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Night ID\",\"name\":\"nid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"x-image position of candidate [pixels]\",\"name\":\"xpos\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"y-image position of candidate [pixels]\",\"name\":\"ypos\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of candidate; J2000 [deg]\",\"name\":\"ra\",\"type\":\"double\"},{\"doc\":\"Declination of candidate; J2000 [deg]\",\"name\":\"dec\",\"type\":\"double\"},{\"doc\":\"Magnitude from PSF-fit photometry [mag]\",\"name\":\"magpsf\",\"type\":\"float\"},{\"doc\":\"1-sigma uncertainty in magpsf [mag]\",\"name\":\"sigmapsf\",\"type\":\"float\"},{\"default\":null,\"doc\":\"Reduced chi-square for PSF-fit\",\"name\":\"chipsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 14 pixel diameter aperture [mag]\",\"name\":\"magap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magap [mag]\",\"name\":\"sigmagap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [pixels]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Local sky background estimate [DN]\",\"name\":\"sky\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: magap - magpsf [mag]\",\"name\":\"magdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]\",\"name\":\"fwhm\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy classification score from SExtractor\",\"name\":\"classtar\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to nearest edge in image [pixels]\",\"name\":\"mindtoedge\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: diffmaglim - magap [mag]\",\"name\":\"magfromlim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: difffwhm / fwhm\",\"name\":\"seeratio\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat major axis from SExtractor [pixels]\",\"name\":\"aimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat minor axis from SExtractor [pixels]\",\"name\":\"bimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / fwhm\",\"name\":\"aimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: bimage / fwhm\",\"name\":\"bimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / bimage\",\"name\":\"elong\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"number of negative pixels in a 5 x 5 pixel stamp\",\"name\":\"nneg\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"number of prior-tagged bad pixels in a 5 x 5 pixel stamp\",\"name\":\"nbad\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"RealBogus quality score from Random Forest classifier; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"rb\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest known solar system object if exists within 30 arcsec [arcsec]\",\"name\":\"ssdistnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]\",\"name\":\"ssmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"name of nearest known solar system object if exists within 30 arcsec (from MPC archive)\",\"name\":\"ssnamenr\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers\",\"name\":\"sumrat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 18 pixel diameter aperture [mag]\",\"name\":\"magapbig\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magapbig [mag]\",\"name\":\"sigmagapbig\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":\"double\"},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":\"double\"},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr1\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of spatially-coincident detections falling within 1.5 arcsec going back to beginning of survey; only detections that fell on the same field and readout-channel ID where the input candidate was observed are counted\",\"name\":\"ndethist\",\"type\":\"int\"},{\"doc\":\"Number of times input candidate position fell on any field and readout-channel going back to beginning of survey\",\"name\":\"ncovhist\",\"type\":\"int\"},{\"default\":null,\"doc\":\"Earliest Julian date of epoch corresponding to ndethist [days]\",\"name\":\"jdstarthist\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Latest Julian date of epoch corresponding to ndethist [days]\",\"name\":\"jdendhist\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Peak-pixel signal-to-noise ratio in point source matched-filtered detection image\",\"name\":\"scorr\",\"type\":[\"null\",\"double\"]},{\"default\":0,\"doc\":\"1 =\\u003e candidate is from a Target-of-Opportunity (ToO) exposure; 0 =\\u003e candidate is from a non-ToO exposure\",\"name\":\"tooflag\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Object ID of closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps1\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Object ID of second closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps2\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of second closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to second closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Object ID of third closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps3\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of third closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to third closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr3\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of source matches from PS1 catalog falling within 30 arcsec\",\"name\":\"nmtchps\",\"type\":\"int\"},{\"doc\":\"Processing ID for reference image to facilitate archive retrieval\",\"name\":\"rfid\",\"type\":\"long\"},{\"doc\":\"Observation Julian date of earliest exposure used to generate reference image [days]\",\"name\":\"jdstartref\",\"type\":\"double\"},{\"doc\":\"Observation Julian date of latest exposure used to generate reference image [days]\",\"name\":\"jdendref\",\"type\":\"double\"},{\"doc\":\"Number of frames (epochal images) used to generate reference image\",\"name\":\"nframesref\",\"type\":\"int\"},{\"doc\":\"version of Random Forest classifier model used to assign RealBogus (rb) quality score\",\"name\":\"rbversion\",\"type\":\"string\"},{\"default\":null,\"doc\":\"Ratio: D/stddev(D) on event position where D = difference image\",\"name\":\"dsnrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: S/stddev(S) on event position where S = image of convolution: D (x) PSF(D)\",\"name\":\"ssnrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference of statistics: dsnrms - ssnrms\",\"name\":\"dsdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of PS1 photometric calibrators used to calibrate science image from science image processing\",\"name\":\"nmatches\",\"type\":\"int\"},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Covariance in magzpsci and clrcoeff from science image processing [mag^2]\",\"name\":\"zpclrcov\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point from median of all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"zpmed\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Median color of all PS1 photometric calibrators used from science image processing [mag]: for filter (fid) = 1, 2, 3, PS1 color used = g-r, g-r, r-i respectively\",\"name\":\"clrmed\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS color (deviation from average) of all PS1 photometric calibrators used from science image processing [mag]\",\"name\":\"clrrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [arcsec]\",\"name\":\"neargaia\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [arcsec]\",\"name\":\"neargaiabright\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Gaia (G-band) magnitude of closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [mag]\",\"name\":\"maggaia\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Gaia (G-band) magnitude of closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [mag]\",\"name\":\"maggaiabright\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Integration time of camera exposure [sec]\",\"name\":\"exptime\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RealBogus quality score from Deep-Learning-based classifier; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"drb\",\"type\":[\"null\",\"float\"]},{\"doc\":\"version of Deep-Learning-based classifier model used to assign RealBogus (drb) quality score\",\"name\":\"drbversion\",\"type\":\"string\"}],\"name\":\"ztf.alert.candidate\",\"type\":\"record\",\"version\":\"3.3\"}"
+	return "{\"doc\":\"avro alert schema\",\"fields\":[{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for science image to facilitate archive retrieval\",\"name\":\"pid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"filename of positive (sci minus ref) difference image\",\"name\":\"pdiffimfilename\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Principal investigator attached to program ID\",\"name\":\"programpi\",\"type\":[\"null\",\"string\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Candidate ID from operations DB\",\"name\":\"candid\",\"type\":\"long\"},{\"doc\":\"t or 1 =\\u003e candidate is from positive (sci minus ref) subtraction; f or 0 =\\u003e candidate is from negative (ref minus sci) subtraction\",\"name\":\"isdiffpos\",\"type\":\"string\"},{\"default\":null,\"doc\":\"Internal pipeline table extraction ID\",\"name\":\"tblid\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Night ID\",\"name\":\"nid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"x-image position of candidate [pixels]\",\"name\":\"xpos\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"y-image position of candidate [pixels]\",\"name\":\"ypos\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of candidate; J2000 [deg]\",\"name\":\"ra\",\"type\":\"double\"},{\"doc\":\"Declination of candidate; J2000 [deg]\",\"name\":\"dec\",\"type\":\"double\"},{\"doc\":\"Magnitude from PSF-fit photometry [mag]\",\"name\":\"magpsf\",\"type\":\"float\"},{\"doc\":\"1-sigma uncertainty in magpsf [mag]\",\"name\":\"sigmapsf\",\"type\":\"float\"},{\"default\":null,\"doc\":\"Reduced chi-square for PSF-fit\",\"name\":\"chipsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 14 pixel diameter aperture [mag]\",\"name\":\"magap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magap [mag]\",\"name\":\"sigmagap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [pixels]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Local sky background estimate [DN]\",\"name\":\"sky\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: magap - magpsf [mag]\",\"name\":\"magdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]\",\"name\":\"fwhm\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy classification score from SExtractor\",\"name\":\"classtar\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to nearest edge in image [pixels]\",\"name\":\"mindtoedge\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: diffmaglim - magap [mag]\",\"name\":\"magfromlim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: difffwhm / fwhm\",\"name\":\"seeratio\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat major axis from SExtractor [pixels]\",\"name\":\"aimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat minor axis from SExtractor [pixels]\",\"name\":\"bimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / fwhm\",\"name\":\"aimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: bimage / fwhm\",\"name\":\"bimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / bimage\",\"name\":\"elong\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"number of negative pixels in a 5 x 5 pixel stamp\",\"name\":\"nneg\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"number of prior-tagged bad pixels in a 5 x 5 pixel stamp\",\"name\":\"nbad\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"RealBogus quality score from Random Forest classifier; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"rb\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest known solar system object if exists within 30 arcsec [arcsec]\",\"name\":\"ssdistnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]\",\"name\":\"ssmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"name of nearest known solar system object if exists within 30 arcsec (from MPC archive)\",\"name\":\"ssnamenr\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers\",\"name\":\"sumrat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 18 pixel diameter aperture [mag]\",\"name\":\"magapbig\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magapbig [mag]\",\"name\":\"sigmagapbig\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":\"double\"},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":\"double\"},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr1\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of spatially-coincident detections falling within 1.5 arcsec going back to beginning of survey; only detections that fell on the same field and readout-channel ID where the input candidate was observed are counted. All raw detections down to a photometric S/N of ~ 3 are included.\",\"name\":\"ndethist\",\"type\":\"int\"},{\"doc\":\"Number of times input candidate position fell on any field and readout-channel going back to beginning of survey\",\"name\":\"ncovhist\",\"type\":\"int\"},{\"default\":null,\"doc\":\"Earliest Julian date of epoch corresponding to ndethist [days]\",\"name\":\"jdstarthist\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Latest Julian date of epoch corresponding to ndethist [days]\",\"name\":\"jdendhist\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Peak-pixel signal-to-noise ratio in point source matched-filtered detection image\",\"name\":\"scorr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"1 =\\u003e candidate is from a Target-of-Opportunity (ToO) exposure; 0 =\\u003e candidate is from a non-ToO exposure\",\"name\":\"tooflag\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Object ID of closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps1\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Object ID of second closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps2\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of second closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to second closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Object ID of third closest source from PS1 catalog; if exists within 30 arcsec\",\"name\":\"objectidps3\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"g-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"sgmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"r-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"srmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"i-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"simag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"z-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]\",\"name\":\"szmag3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy score of third closest source from PS1 catalog; if exists within 30 arcsec: 0 \\u003c= sgscore \\u003c= 1 where closer to 1 implies higher likelihood of being a star\",\"name\":\"sgscore3\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to third closest source from PS1 catalog; if exists within 30 arcsec [arcsec]\",\"name\":\"distpsnr3\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of source matches from PS1 catalog falling within 30 arcsec\",\"name\":\"nmtchps\",\"type\":\"int\"},{\"doc\":\"Processing ID for reference image to facilitate archive retrieval\",\"name\":\"rfid\",\"type\":\"long\"},{\"doc\":\"Observation Julian date of earliest exposure used to generate reference image [days]\",\"name\":\"jdstartref\",\"type\":\"double\"},{\"doc\":\"Observation Julian date of latest exposure used to generate reference image [days]\",\"name\":\"jdendref\",\"type\":\"double\"},{\"doc\":\"Number of frames (epochal images) used to generate reference image\",\"name\":\"nframesref\",\"type\":\"int\"},{\"doc\":\"version of Random Forest classifier model used to assign RealBogus (rb) quality score\",\"name\":\"rbversion\",\"type\":\"string\"},{\"default\":null,\"doc\":\"Ratio: D/stddev(D) on event position where D = difference image\",\"name\":\"dsnrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: S/stddev(S) on event position where S = image of convolution: D (x) PSF(D)\",\"name\":\"ssnrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference of statistics: dsnrms - ssnrms\",\"name\":\"dsdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Number of PS1 photometric calibrators used to calibrate science image from science image processing\",\"name\":\"nmatches\",\"type\":\"int\"},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Covariance in magzpsci and clrcoeff from science image processing [mag^2]\",\"name\":\"zpclrcov\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point from median of all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"zpmed\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Median color of all PS1 photometric calibrators used from science image processing [mag]: for filter (fid) = 1, 2, 3, PS1 color used = g-r, g-r, r-i respectively\",\"name\":\"clrmed\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS color (deviation from average) of all PS1 photometric calibrators used from science image processing [mag]\",\"name\":\"clrrms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [arcsec]\",\"name\":\"neargaia\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [arcsec]\",\"name\":\"neargaiabright\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Gaia (G-band) magnitude of closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [mag]\",\"name\":\"maggaia\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Gaia (G-band) magnitude of closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [mag]\",\"name\":\"maggaiabright\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Integration time of camera exposure [sec]\",\"name\":\"exptime\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RealBogus quality score from Deep-Learning-based classifier; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"drb\",\"type\":[\"null\",\"float\"]},{\"doc\":\"version of Deep-Learning-based classifier model used to assign RealBogus (drb) quality score\",\"name\":\"drbversion\",\"type\":\"string\"}],\"name\":\"ztf.alert.candidate\",\"type\":\"record\",\"version\":\"4.02\"}"
 }
 
 func (r *Candidate) SchemaName() string {
diff --git a/schema/candidate_container.go b/schema/candidate_container.go
index 51e58ca..ad6c64b 100644
--- a/schema/candidate_container.go
+++ b/schema/candidate_container.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/cutout.go b/schema/cutout.go
index a43dc92..30d0869 100644
--- a/schema/cutout.go
+++ b/schema/cutout.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
@@ -88,7 +89,7 @@ func (r *Cutout) Serialize(w io.Writer) error {
 }
 
 func (r *Cutout) Schema() string {
-	return "{\"doc\":\"avro alert schema\",\"fields\":[{\"name\":\"fileName\",\"type\":\"string\"},{\"doc\":\"fits.gz\",\"name\":\"stampData\",\"type\":\"bytes\"}],\"name\":\"ztf.alert.cutout\",\"type\":\"record\",\"version\":\"3.3\"}"
+	return "{\"doc\":\"avro alert schema\",\"fields\":[{\"name\":\"fileName\",\"type\":\"string\"},{\"doc\":\"fits.gz\",\"name\":\"stampData\",\"type\":\"bytes\"}],\"name\":\"ztf.alert.cutout\",\"type\":\"record\",\"version\":\"4.02\"}"
 }
 
 func (r *Cutout) SchemaName() string {
diff --git a/schema/cutout_container.go b/schema/cutout_container.go
index d69dd1c..820b9a9 100644
--- a/schema/cutout_container.go
+++ b/schema/cutout_container.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/fp_hist.go b/schema/fp_hist.go
new file mode 100644
index 0000000..eb3b59b
--- /dev/null
+++ b/schema/fp_hist.go
@@ -0,0 +1,863 @@
+// Code generated by github.com/actgardner/gogen-avro. DO NOT EDIT.
+/*
+ * SOURCES:
+ *     alert.avsc
+ *     candidate.avsc
+ *     cutout.avsc
+ *     fp_hist.avsc
+ *     prv_candidate.avsc
+ */
+package schema
+
+import (
+	"io"
+	"github.com/actgardner/gogen-avro/vm/types"
+	"github.com/actgardner/gogen-avro/vm"
+	"github.com/actgardner/gogen-avro/compiler"
+)
+
+// avro alert schema
+type Fp_hist struct {
+
+	
+	// ZTF field ID
+	
+	
+		Field *UnionNullInt
+	
+
+	
+	// Readout channel ID [00 .. 63]
+	
+	
+		Rcid *UnionNullInt
+	
+
+	
+	// Filter ID (1=g; 2=R; 3=i)
+	
+	
+		Fid int32
+	
+
+	
+	// Processing ID for image
+	
+	
+		Pid int64
+	
+
+	
+	// Processing ID for reference image to facilitate archive retrieval
+	
+	
+		Rfid int64
+	
+
+	
+	// Effective FWHM of sci image [pixels]
+	
+	
+		Sciinpseeing *UnionNullFloat
+	
+
+	
+	// Background level in sci image [DN]
+	
+	
+		Scibckgnd *UnionNullFloat
+	
+
+	
+	// Robust sigma per pixel in sci image [DN]
+	
+	
+		Scisigpix *UnionNullFloat
+	
+
+	
+	// Magnitude zero point for photometry estimates [mag]
+	
+	
+		Magzpsci *UnionNullFloat
+	
+
+	
+	// Magnitude zero point uncertainty (in magzpsci) [mag]
+	
+	
+		Magzpsciunc *UnionNullFloat
+	
+
+	
+	// RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]
+	
+	
+		Magzpscirms *UnionNullFloat
+	
+
+	
+	// Color coefficient from linear fit from photometric calibration of science image
+	
+	
+		Clrcoeff *UnionNullFloat
+	
+
+	
+	// Color coefficient uncertainty from linear fit (corresponding to clrcoeff)
+	
+	
+		Clrcounc *UnionNullFloat
+	
+
+	
+	// Integration time of camera exposure [sec]
+	
+	
+		Exptime *UnionNullFloat
+	
+
+	
+	// Full sci image astrometric RMS along R.A. with respect to Gaia1 [arcsec]
+	
+	
+		Adpctdif1 *UnionNullFloat
+	
+
+	
+	// Full sci image astrometric RMS along Dec. with respect to Gaia1 [arcsec]
+	
+	
+		Adpctdif2 *UnionNullFloat
+	
+
+	
+	// Expected 5-sigma mag limit in difference image based on global noise estimate [mag]
+	
+	
+		Diffmaglim *UnionNullFloat
+	
+
+	
+	// Program ID: encodes either public, collab, or caltech mode
+	
+	
+		Programid int32
+	
+
+	
+	// Observation Julian date at start of exposure [days]
+	
+	
+		Jd float64
+	
+
+	
+	// Forced difference image PSF-fit flux [DN]
+	
+	
+		Forcediffimflux *UnionNullFloat
+	
+
+	
+	// 1-sigma uncertainty in forcediffimflux [DN]
+	
+	
+		Forcediffimfluxunc *UnionNullFloat
+	
+
+	
+	// Forced photometry processing status codes (0 => no warnings); see documentation
+	
+	
+		Procstatus *UnionNullString
+	
+
+	
+	// distance to nearest source in reference image PSF-catalog [arcsec]
+	
+	
+		Distnr *UnionNullFloat
+	
+
+	
+	// Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]
+	
+	
+		Ranr float64
+	
+
+	
+	// Declination of nearest source in reference image PSF-catalog; J2000 [deg]
+	
+	
+		Decnr float64
+	
+
+	
+	// magnitude of nearest source in reference image PSF-catalog [mag]
+	
+	
+		Magnr *UnionNullFloat
+	
+
+	
+	// 1-sigma uncertainty in magnr [mag]
+	
+	
+		Sigmagnr *UnionNullFloat
+	
+
+	
+	// DAOPhot chi parameter of nearest source in reference image PSF-catalog
+	
+	
+		Chinr *UnionNullFloat
+	
+
+	
+	// DAOPhot sharp parameter of nearest source in reference image PSF-catalog
+	
+	
+		Sharpnr *UnionNullFloat
+	
+
+}
+
+const Fp_histAvroCRC64Fingerprint = "lսiy\x19\xa2g"
+
+func NewFp_hist() (*Fp_hist) {
+	return &Fp_hist{}
+}
+
+func DeserializeFp_hist(r io.Reader) (*Fp_hist, error) {
+	t := NewFp_hist()
+	deser, err := compiler.CompileSchemaBytes([]byte(t.Schema()), []byte(t.Schema()))
+	if err != nil {
+		return nil, err
+	}
+
+	err = vm.Eval(r, deser, t)
+	if err != nil {
+		return nil, err
+	}
+	return t, err
+}
+
+func DeserializeFp_histFromSchema(r io.Reader, schema string) (*Fp_hist, error) {
+	t := NewFp_hist()
+
+	deser, err := compiler.CompileSchemaBytes([]byte(schema), []byte(t.Schema()))
+	if err != nil {
+		return nil, err
+	}
+
+	err = vm.Eval(r, deser, t)
+	if err != nil {
+		return nil, err
+	}
+	return t, err
+}
+
+func writeFp_hist(r *Fp_hist, w io.Writer) error {
+	var err error
+	
+	err = writeUnionNullInt( r.Field, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullInt( r.Rcid, w)
+	if err != nil {
+		return err
+	}
+	
+	err = vm.WriteInt( r.Fid, w)
+	if err != nil {
+		return err
+	}
+	
+	err = vm.WriteLong( r.Pid, w)
+	if err != nil {
+		return err
+	}
+	
+	err = vm.WriteLong( r.Rfid, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Sciinpseeing, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Scibckgnd, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Scisigpix, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Magzpsci, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Magzpsciunc, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Magzpscirms, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Clrcoeff, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Clrcounc, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Exptime, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Adpctdif1, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Adpctdif2, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Diffmaglim, w)
+	if err != nil {
+		return err
+	}
+	
+	err = vm.WriteInt( r.Programid, w)
+	if err != nil {
+		return err
+	}
+	
+	err = vm.WriteDouble( r.Jd, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Forcediffimflux, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Forcediffimfluxunc, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullString( r.Procstatus, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Distnr, w)
+	if err != nil {
+		return err
+	}
+	
+	err = vm.WriteDouble( r.Ranr, w)
+	if err != nil {
+		return err
+	}
+	
+	err = vm.WriteDouble( r.Decnr, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Magnr, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Sigmagnr, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Chinr, w)
+	if err != nil {
+		return err
+	}
+	
+	err = writeUnionNullFloat( r.Sharpnr, w)
+	if err != nil {
+		return err
+	}
+	
+	return err
+}
+
+func (r *Fp_hist) Serialize(w io.Writer) error {
+	return writeFp_hist(r, w)
+}
+
+func (r *Fp_hist) Schema() string {
+	return "{\"doc\":\"avro alert schema\",\"fields\":[{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for image\",\"name\":\"pid\",\"type\":\"long\"},{\"doc\":\"Processing ID for reference image to facilitate archive retrieval\",\"name\":\"rfid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Effective FWHM of sci image [pixels]\",\"name\":\"sciinpseeing\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Background level in sci image [DN]\",\"name\":\"scibckgnd\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Robust sigma per pixel in sci image [DN]\",\"name\":\"scisigpix\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Integration time of camera exposure [sec]\",\"name\":\"exptime\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full sci image astrometric RMS along R.A. with respect to Gaia1 [arcsec]\",\"name\":\"adpctdif1\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full sci image astrometric RMS along Dec. with respect to Gaia1 [arcsec]\",\"name\":\"adpctdif2\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"default\":null,\"doc\":\"Forced difference image PSF-fit flux [DN]\",\"name\":\"forcediffimflux\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in forcediffimflux [DN]\",\"name\":\"forcediffimfluxunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Forced photometry processing status codes (0 =\\u003e no warnings); see documentation\",\"name\":\"procstatus\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [arcsec]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":\"double\"},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":\"double\"},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]}],\"name\":\"ztf.alert.fp_hist\",\"type\":\"record\",\"version\":\"4.02\"}"
+}
+
+func (r *Fp_hist) SchemaName() string {
+	return "ztf.alert.fp_hist"
+}
+
+func (_ *Fp_hist) SetBoolean(v bool) { panic("Unsupported operation") }
+func (_ *Fp_hist) SetInt(v int32) { panic("Unsupported operation") }
+func (_ *Fp_hist) SetLong(v int64) { panic("Unsupported operation") }
+func (_ *Fp_hist) SetFloat(v float32) { panic("Unsupported operation") }
+func (_ *Fp_hist) SetDouble(v float64) { panic("Unsupported operation") }
+func (_ *Fp_hist) SetBytes(v []byte) { panic("Unsupported operation") }
+func (_ *Fp_hist) SetString(v string) { panic("Unsupported operation") }
+func (_ *Fp_hist) SetUnionElem(v int64) { panic("Unsupported operation") }
+
+func (r *Fp_hist) Get(i int) types.Field {
+	switch (i) {
+	
+	case 0:
+		
+			r.Field = NewUnionNullInt()
+
+		
+		
+			return r.Field
+		
+	
+	case 1:
+		
+			r.Rcid = NewUnionNullInt()
+
+		
+		
+			return r.Rcid
+		
+	
+	case 2:
+		
+		
+			return (*types.Int)(&r.Fid)
+		
+	
+	case 3:
+		
+		
+			return (*types.Long)(&r.Pid)
+		
+	
+	case 4:
+		
+		
+			return (*types.Long)(&r.Rfid)
+		
+	
+	case 5:
+		
+			r.Sciinpseeing = NewUnionNullFloat()
+
+		
+		
+			return r.Sciinpseeing
+		
+	
+	case 6:
+		
+			r.Scibckgnd = NewUnionNullFloat()
+
+		
+		
+			return r.Scibckgnd
+		
+	
+	case 7:
+		
+			r.Scisigpix = NewUnionNullFloat()
+
+		
+		
+			return r.Scisigpix
+		
+	
+	case 8:
+		
+			r.Magzpsci = NewUnionNullFloat()
+
+		
+		
+			return r.Magzpsci
+		
+	
+	case 9:
+		
+			r.Magzpsciunc = NewUnionNullFloat()
+
+		
+		
+			return r.Magzpsciunc
+		
+	
+	case 10:
+		
+			r.Magzpscirms = NewUnionNullFloat()
+
+		
+		
+			return r.Magzpscirms
+		
+	
+	case 11:
+		
+			r.Clrcoeff = NewUnionNullFloat()
+
+		
+		
+			return r.Clrcoeff
+		
+	
+	case 12:
+		
+			r.Clrcounc = NewUnionNullFloat()
+
+		
+		
+			return r.Clrcounc
+		
+	
+	case 13:
+		
+			r.Exptime = NewUnionNullFloat()
+
+		
+		
+			return r.Exptime
+		
+	
+	case 14:
+		
+			r.Adpctdif1 = NewUnionNullFloat()
+
+		
+		
+			return r.Adpctdif1
+		
+	
+	case 15:
+		
+			r.Adpctdif2 = NewUnionNullFloat()
+
+		
+		
+			return r.Adpctdif2
+		
+	
+	case 16:
+		
+			r.Diffmaglim = NewUnionNullFloat()
+
+		
+		
+			return r.Diffmaglim
+		
+	
+	case 17:
+		
+		
+			return (*types.Int)(&r.Programid)
+		
+	
+	case 18:
+		
+		
+			return (*types.Double)(&r.Jd)
+		
+	
+	case 19:
+		
+			r.Forcediffimflux = NewUnionNullFloat()
+
+		
+		
+			return r.Forcediffimflux
+		
+	
+	case 20:
+		
+			r.Forcediffimfluxunc = NewUnionNullFloat()
+
+		
+		
+			return r.Forcediffimfluxunc
+		
+	
+	case 21:
+		
+			r.Procstatus = NewUnionNullString()
+
+		
+		
+			return r.Procstatus
+		
+	
+	case 22:
+		
+			r.Distnr = NewUnionNullFloat()
+
+		
+		
+			return r.Distnr
+		
+	
+	case 23:
+		
+		
+			return (*types.Double)(&r.Ranr)
+		
+	
+	case 24:
+		
+		
+			return (*types.Double)(&r.Decnr)
+		
+	
+	case 25:
+		
+			r.Magnr = NewUnionNullFloat()
+
+		
+		
+			return r.Magnr
+		
+	
+	case 26:
+		
+			r.Sigmagnr = NewUnionNullFloat()
+
+		
+		
+			return r.Sigmagnr
+		
+	
+	case 27:
+		
+			r.Chinr = NewUnionNullFloat()
+
+		
+		
+			return r.Chinr
+		
+	
+	case 28:
+		
+			r.Sharpnr = NewUnionNullFloat()
+
+		
+		
+			return r.Sharpnr
+		
+	
+	}
+	panic("Unknown field index")
+}
+
+func (r *Fp_hist) SetDefault(i int) {
+	switch (i) {
+	
+        
+	case 0:
+       	 	r.Field = NewUnionNullInt()
+
+		return
+	
+	
+        
+	case 1:
+       	 	r.Rcid = NewUnionNullInt()
+
+		return
+	
+	
+        
+	
+        
+	
+        
+	
+        
+	case 5:
+       	 	r.Sciinpseeing = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 6:
+       	 	r.Scibckgnd = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 7:
+       	 	r.Scisigpix = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 8:
+       	 	r.Magzpsci = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 9:
+       	 	r.Magzpsciunc = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 10:
+       	 	r.Magzpscirms = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 11:
+       	 	r.Clrcoeff = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 12:
+       	 	r.Clrcounc = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 13:
+       	 	r.Exptime = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 14:
+       	 	r.Adpctdif1 = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 15:
+       	 	r.Adpctdif2 = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 16:
+       	 	r.Diffmaglim = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	
+        
+	
+        
+	case 19:
+       	 	r.Forcediffimflux = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 20:
+       	 	r.Forcediffimfluxunc = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 21:
+       	 	r.Procstatus = NewUnionNullString()
+
+		return
+	
+	
+        
+	case 22:
+       	 	r.Distnr = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	
+        
+	
+        
+	case 25:
+       	 	r.Magnr = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 26:
+       	 	r.Sigmagnr = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 27:
+       	 	r.Chinr = NewUnionNullFloat()
+
+		return
+	
+	
+        
+	case 28:
+       	 	r.Sharpnr = NewUnionNullFloat()
+
+		return
+	
+	
+	}
+	panic("Unknown field index")
+}
+
+func (_ *Fp_hist) AppendMap(key string) types.Field { panic("Unsupported operation") }
+func (_ *Fp_hist) AppendArray() types.Field { panic("Unsupported operation") }
+func (_ *Fp_hist) Finalize() { }
+
+
+func (_ *Fp_hist) AvroCRC64Fingerprint() []byte {
+  return []byte(Fp_histAvroCRC64Fingerprint)
+}
diff --git a/schema/fp_hist_container.go b/schema/fp_hist_container.go
new file mode 100644
index 0000000..6f52ee4
--- /dev/null
+++ b/schema/fp_hist_container.go
@@ -0,0 +1,53 @@
+// Code generated by github.com/actgardner/gogen-avro. DO NOT EDIT.
+/*
+ * SOURCES:
+ *     alert.avsc
+ *     candidate.avsc
+ *     cutout.avsc
+ *     fp_hist.avsc
+ *     prv_candidate.avsc
+ */
+package schema
+
+import (
+	"io"
+
+	"github.com/actgardner/gogen-avro/container"
+	"github.com/actgardner/gogen-avro/vm"
+	"github.com/actgardner/gogen-avro/compiler"
+)
+
+func NewFp_histWriter(writer io.Writer, codec container.Codec, recordsPerBlock int64) (*container.Writer, error) {
+	str := NewFp_hist()
+	return container.NewWriter(writer, codec, recordsPerBlock, str.Schema())
+}
+
+// container reader
+type Fp_histReader struct {
+	r io.Reader
+	p *vm.Program
+}
+
+func NewFp_histReader(r io.Reader) (*Fp_histReader, error){
+	containerReader, err := container.NewReader(r)
+	if err != nil {
+		return nil, err
+	}
+
+	t := NewFp_hist()
+	deser, err := compiler.CompileSchemaBytes([]byte(containerReader.AvroContainerSchema()), []byte(t.Schema()))
+	if err != nil {
+		return nil, err
+	}
+
+	return &Fp_histReader {
+		r: containerReader,
+		p: deser,
+	}, nil
+}
+
+func (r Fp_histReader) Read() (*Fp_hist, error) {
+	t := NewFp_hist()
+        err := vm.Eval(r.r, r.p, t)
+	return t, err
+}
diff --git a/schema/prv_candidate.go b/schema/prv_candidate.go
index 2b0b2e8..e09b205 100644
--- a/schema/prv_candidate.go
+++ b/schema/prv_candidate.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
@@ -750,7 +751,7 @@ func (r *Prv_candidate) Serialize(w io.Writer) error {
 }
 
 func (r *Prv_candidate) Schema() string {
-	return "{\"doc\":\"avro alert schema\",\"fields\":[{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for image\",\"name\":\"pid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"filename of positive (sci minus ref) difference image\",\"name\":\"pdiffimfilename\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Principal investigator attached to program ID\",\"name\":\"programpi\",\"type\":[\"null\",\"string\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Candidate ID from operations DB\",\"name\":\"candid\",\"type\":[\"null\",\"long\"]},{\"doc\":\"t or 1 =\\u003e candidate is from positive (sci minus ref) subtraction; f or 0 =\\u003e candidate is from negative (ref minus sci) subtraction\",\"name\":\"isdiffpos\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Internal pipeline table extraction ID\",\"name\":\"tblid\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Night ID\",\"name\":\"nid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"x-image position of candidate [pixels]\",\"name\":\"xpos\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"y-image position of candidate [pixels]\",\"name\":\"ypos\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of candidate; J2000 [deg]\",\"name\":\"ra\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Declination of candidate; J2000 [deg]\",\"name\":\"dec\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Magnitude from PSF-fit photometry [mag]\",\"name\":\"magpsf\",\"type\":[\"null\",\"float\"]},{\"doc\":\"1-sigma uncertainty in magpsf [mag]\",\"name\":\"sigmapsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Reduced chi-square for PSF-fit\",\"name\":\"chipsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 14 pixel diameter aperture [mag]\",\"name\":\"magap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magap [mag]\",\"name\":\"sigmagap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [pixels]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Local sky background estimate [DN]\",\"name\":\"sky\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: magap - magpsf [mag]\",\"name\":\"magdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]\",\"name\":\"fwhm\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy classification score from SExtractor\",\"name\":\"classtar\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to nearest edge in image [pixels]\",\"name\":\"mindtoedge\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: diffmaglim - magap [mag]\",\"name\":\"magfromlim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: difffwhm / fwhm\",\"name\":\"seeratio\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat major axis from SExtractor [pixels]\",\"name\":\"aimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat minor axis from SExtractor [pixels]\",\"name\":\"bimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / fwhm\",\"name\":\"aimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: bimage / fwhm\",\"name\":\"bimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / bimage\",\"name\":\"elong\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"number of negative pixels in a 5 x 5 pixel stamp\",\"name\":\"nneg\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"number of prior-tagged bad pixels in a 5 x 5 pixel stamp\",\"name\":\"nbad\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"RealBogus quality score; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"rb\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest known solar system object if exists within 30 arcsec [arcsec]\",\"name\":\"ssdistnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]\",\"name\":\"ssmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"name of nearest known solar system object if exists within 30 arcsec (from MPC archive)\",\"name\":\"ssnamenr\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers\",\"name\":\"sumrat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 18 pixel diameter aperture [mag]\",\"name\":\"magapbig\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magapbig [mag]\",\"name\":\"sigmagapbig\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Peak-pixel signal-to-noise ratio in point source matched-filtered detection image\",\"name\":\"scorr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"doc\":\"version of RealBogus model/classifier used to assign rb quality score\",\"name\":\"rbversion\",\"type\":\"string\"}],\"name\":\"ztf.alert.prv_candidate\",\"type\":\"record\",\"version\":\"3.3\"}"
+	return "{\"doc\":\"avro alert schema\",\"fields\":[{\"doc\":\"Observation Julian date at start of exposure [days]\",\"name\":\"jd\",\"type\":\"double\"},{\"doc\":\"Filter ID (1=g; 2=R; 3=i)\",\"name\":\"fid\",\"type\":\"int\"},{\"doc\":\"Processing ID for image\",\"name\":\"pid\",\"type\":\"long\"},{\"default\":null,\"doc\":\"Expected 5-sigma mag limit in difference image based on global noise estimate [mag]\",\"name\":\"diffmaglim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"filename of positive (sci minus ref) difference image\",\"name\":\"pdiffimfilename\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Principal investigator attached to program ID\",\"name\":\"programpi\",\"type\":[\"null\",\"string\"]},{\"doc\":\"Program ID: encodes either public, collab, or caltech mode\",\"name\":\"programid\",\"type\":\"int\"},{\"doc\":\"Candidate ID from operations DB\",\"name\":\"candid\",\"type\":[\"null\",\"long\"]},{\"doc\":\"t or 1 =\\u003e candidate is from positive (sci minus ref) subtraction; f or 0 =\\u003e candidate is from negative (ref minus sci) subtraction\",\"name\":\"isdiffpos\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Internal pipeline table extraction ID\",\"name\":\"tblid\",\"type\":[\"null\",\"long\"]},{\"default\":null,\"doc\":\"Night ID\",\"name\":\"nid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"Readout channel ID [00 .. 63]\",\"name\":\"rcid\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"ZTF field ID\",\"name\":\"field\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"x-image position of candidate [pixels]\",\"name\":\"xpos\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"y-image position of candidate [pixels]\",\"name\":\"ypos\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of candidate; J2000 [deg]\",\"name\":\"ra\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Declination of candidate; J2000 [deg]\",\"name\":\"dec\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Magnitude from PSF-fit photometry [mag]\",\"name\":\"magpsf\",\"type\":[\"null\",\"float\"]},{\"doc\":\"1-sigma uncertainty in magpsf [mag]\",\"name\":\"sigmapsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Reduced chi-square for PSF-fit\",\"name\":\"chipsf\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 14 pixel diameter aperture [mag]\",\"name\":\"magap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magap [mag]\",\"name\":\"sigmagap\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest source in reference image PSF-catalog [pixels]\",\"name\":\"distnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest source in reference image PSF-catalog [mag]\",\"name\":\"magnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magnr [mag]\",\"name\":\"sigmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot chi parameter of nearest source in reference image PSF-catalog\",\"name\":\"chinr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"DAOPhot sharp parameter of nearest source in reference image PSF-catalog\",\"name\":\"sharpnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Local sky background estimate [DN]\",\"name\":\"sky\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: magap - magpsf [mag]\",\"name\":\"magdiff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]\",\"name\":\"fwhm\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Star/Galaxy classification score from SExtractor\",\"name\":\"classtar\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Distance to nearest edge in image [pixels]\",\"name\":\"mindtoedge\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Difference: diffmaglim - magap [mag]\",\"name\":\"magfromlim\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: difffwhm / fwhm\",\"name\":\"seeratio\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat major axis from SExtractor [pixels]\",\"name\":\"aimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Windowed profile RMS afloat minor axis from SExtractor [pixels]\",\"name\":\"bimage\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / fwhm\",\"name\":\"aimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: bimage / fwhm\",\"name\":\"bimagerat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Ratio: aimage / bimage\",\"name\":\"elong\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"number of negative pixels in a 5 x 5 pixel stamp\",\"name\":\"nneg\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"number of prior-tagged bad pixels in a 5 x 5 pixel stamp\",\"name\":\"nbad\",\"type\":[\"null\",\"int\"]},{\"default\":null,\"doc\":\"RealBogus quality score; range is 0 to 1 where closer to 1 is more reliable\",\"name\":\"rb\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"distance to nearest known solar system object if exists within 30 arcsec [arcsec]\",\"name\":\"ssdistnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]\",\"name\":\"ssmagnr\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"name of nearest known solar system object if exists within 30 arcsec (from MPC archive)\",\"name\":\"ssnamenr\",\"type\":[\"null\",\"string\"]},{\"default\":null,\"doc\":\"Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers\",\"name\":\"sumrat\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Aperture mag using 18 pixel diameter aperture [mag]\",\"name\":\"magapbig\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"1-sigma uncertainty in magapbig [mag]\",\"name\":\"sigmagapbig\",\"type\":[\"null\",\"float\"]},{\"doc\":\"Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"ranr\",\"type\":[\"null\",\"double\"]},{\"doc\":\"Declination of nearest source in reference image PSF-catalog; J2000 [deg]\",\"name\":\"decnr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Peak-pixel signal-to-noise ratio in point source matched-filtered detection image\",\"name\":\"scorr\",\"type\":[\"null\",\"double\"]},{\"default\":null,\"doc\":\"Magnitude zero point for photometry estimates [mag]\",\"name\":\"magzpsci\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Magnitude zero point uncertainty (in magzpsci) [mag]\",\"name\":\"magzpsciunc\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]\",\"name\":\"magzpscirms\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient from linear fit from photometric calibration of science image\",\"name\":\"clrcoeff\",\"type\":[\"null\",\"float\"]},{\"default\":null,\"doc\":\"Color coefficient uncertainty from linear fit (corresponding to clrcoeff)\",\"name\":\"clrcounc\",\"type\":[\"null\",\"float\"]},{\"doc\":\"version of RealBogus model/classifier used to assign rb quality score\",\"name\":\"rbversion\",\"type\":\"string\"}],\"name\":\"ztf.alert.prv_candidate\",\"type\":\"record\",\"version\":\"4.02\"}"
 }
 
 func (r *Prv_candidate) SchemaName() string {
diff --git a/schema/prv_candidate_container.go b/schema/prv_candidate_container.go
index db87249..e3506b4 100644
--- a/schema/prv_candidate_container.go
+++ b/schema/prv_candidate_container.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/schema-avro/alert.avsc b/schema/schema-avro/alert.avsc
index a9dcef8..1c37678 100644
--- a/schema/schema-avro/alert.avsc
+++ b/schema/schema-avro/alert.avsc
@@ -1,21 +1,23 @@
 {
-    "namespace": "ztf",
-    "type": "record",
-    "name": "alert",
-    "doc": "avro alert schema for ZTF (www.ztf.caltech.edu)",
-    "version": "3.3",
-    "fields": [
-        {"name": "schemavsn", "type": "string", "doc": "schema version used"},
-        {"name": "publisher", "type": "string", "doc": "origin of alert packet"},
-	{"name": "objectId", "type": "string", "doc": "object identifier or name"},
-	{"name": "candid", "type": "long"},
-	{"name": "candidate", "type": "ztf.alert.candidate"},
-	{"name": "prv_candidates", "type": [
-            "null", {
-	    "type": "array",
-	    "items": "ztf.alert.prv_candidate"}], "default": null},
-	{"name": "cutoutScience", "type": ["null", "ztf.alert.cutout"], "default": null},
-	{"name": "cutoutTemplate", "type": ["null", "ztf.alert.cutout"], "default": null},
-	{"name": "cutoutDifference", "type": ["null", "ztf.alert.cutout"], "default": null}
-    ]
+	"namespace": "ztf",
+	"type": "record",
+	"name": "alert",
+	"doc": "avro alert schema for ZTF (www.ztf.caltech.edu)",
+	"version": "4.02",
+	"fields": [
+                {"name": "schemavsn", "type": "string", "doc": "schema version used"},
+                {"name": "publisher", "type": "string", "doc": "origin of alert packet"},
+		{"name": "objectId", "type": "string", "doc": "object identifier or name"},
+		{"name": "candid", "type": "long"},
+		{"name": "candidate", "type": "ztf.alert.candidate"},
+		{"name": "prv_candidates", "type": ["null", {
+				"type": "array",
+				"items": "ztf.alert.prv_candidate"}], "default": null},
+                {"name": "fp_hists", "type": ["null", {
+                                "type": "array",
+                                "items": "ztf.alert.fp_hist"}], "default": null},
+		{"name": "cutoutScience", "type": ["null", "ztf.alert.cutout"], "default": null},
+		{"name": "cutoutTemplate", "type": ["null", "ztf.alert.cutout"], "default": null},
+		{"name": "cutoutDifference", "type": ["null", "ztf.alert.cutout"], "default": null}
+			]
 }
diff --git a/schema/schema-avro/candidate.avsc b/schema/schema-avro/candidate.avsc
index 0fb50d8..0b071f8 100644
--- a/schema/schema-avro/candidate.avsc
+++ b/schema/schema-avro/candidate.avsc
@@ -1,112 +1,112 @@
 {
-    "namespace": "ztf.alert",
-    "name": "candidate",
-    "doc": "avro alert schema",
-    "version": "3.3",
-    "type": "record",
-    "fields": [
-	{"name": "jd", "type": "double", "doc": "Observation Julian date at start of exposure [days]"},
-	{"name": "fid", "type": "int", "doc": "Filter ID (1=g; 2=R; 3=i)"},
-	{"name": "pid", "type": "long", "doc": "Processing ID for science image to facilitate archive retrieval"},
-	{"name": "diffmaglim", "type": [ "null", "float"], "default": null, "doc": "Expected 5-sigma mag limit in difference image based on global noise estimate [mag]"},
-	{"name": "pdiffimfilename", "type": ["null", "string"], "default": null, "doc": "filename of positive (sci minus ref) difference image"},
-	{"name": "programpi", "type": ["null", "string"], "default": null, "doc": "Principal investigator attached to program ID"},
-	{"name": "programid", "type": "int", "doc": "Program ID: encodes either public, collab, or caltech mode"},
-	{"name": "candid", "type": "long", "doc": "Candidate ID from operations DB"},
-	{"name": "isdiffpos", "type": "string", "doc": "t or 1 => candidate is from positive (sci minus ref) subtraction; f or 0 => candidate is from negative (ref minus sci) subtraction"},
-	{"name": "tblid", "type": ["null", "long"], "default": null, "doc": "Internal pipeline table extraction ID"},
-	{"name": "nid", "type": ["null", "int"], "default": null, "doc": "Night ID"},
-	{"name": "rcid", "type": ["null", "int"], "default": null, "doc": "Readout channel ID [00 .. 63]"},
-	{"name": "field", "type": ["null", "int"], "default": null, "doc": "ZTF field ID"},
-	{"name": "xpos", "type": ["null", "float"], "default": null, "doc": "x-image position of candidate [pixels]"},
-	{"name": "ypos", "type": ["null", "float"], "default": null, "doc": "y-image position of candidate [pixels]"},
-	{"name": "ra", "type": "double", "doc": "Right Ascension of candidate; J2000 [deg]"},
-	{"name": "dec", "type": "double", "doc": "Declination of candidate; J2000 [deg]"},
-	{"name": "magpsf", "type": "float", "doc": "Magnitude from PSF-fit photometry [mag]"},
-	{"name": "sigmapsf", "type": "float", "doc": "1-sigma uncertainty in magpsf [mag]"},
-	{"name": "chipsf", "type": ["null", "float"], "default": null, "doc": "Reduced chi-square for PSF-fit"},
-	{"name": "magap", "type": ["null", "float"], "default": null, "doc": "Aperture mag using 14 pixel diameter aperture [mag]"},
-	{"name": "sigmagap", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magap [mag]"},
-	{"name": "distnr", "type": ["null", "float"], "default": null, "doc": "distance to nearest source in reference image PSF-catalog [pixels]"},
-	{"name": "magnr", "type": ["null", "float"], "default": null, "doc": "magnitude of nearest source in reference image PSF-catalog [mag]"},
-	{"name": "sigmagnr", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magnr [mag]"},
-	{"name": "chinr", "type": ["null", "float"], "default": null, "doc": "DAOPhot chi parameter of nearest source in reference image PSF-catalog"},
-	{"name": "sharpnr", "type": ["null", "float"], "default": null, "doc": "DAOPhot sharp parameter of nearest source in reference image PSF-catalog"},
-	{"name": "sky", "type": ["null", "float"], "default": null, "doc": "Local sky background estimate [DN]"},
-	{"name": "magdiff", "type": ["null", "float"], "default": null, "doc": "Difference: magap - magpsf [mag]"},
-	{"name": "fwhm", "type": ["null", "float"], "default": null, "doc": "Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]"},
-	{"name": "classtar", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy classification score from SExtractor"},
-	{"name": "mindtoedge", "type": ["null", "float"], "default": null, "doc": "Distance to nearest edge in image [pixels]"},
-	{"name": "magfromlim", "type": ["null", "float"], "default": null, "doc": "Difference: diffmaglim - magap [mag]"},
-	{"name": "seeratio", "type": ["null", "float"], "default": null, "doc": "Ratio: difffwhm / fwhm"},
-	{"name": "aimage", "type": ["null", "float"], "default": null, "doc": "Windowed profile RMS afloat major axis from SExtractor [pixels]"},
-	{"name": "bimage", "type": ["null", "float"], "default": null, "doc": "Windowed profile RMS afloat minor axis from SExtractor [pixels]"},
-	{"name": "aimagerat", "type": ["null", "float"], "default": null, "doc": "Ratio: aimage / fwhm"},
-	{"name": "bimagerat", "type": ["null", "float"], "default": null, "doc": "Ratio: bimage / fwhm"},
-	{"name": "elong", "type": ["null", "float"], "default": null, "doc": "Ratio: aimage / bimage"},
-	{"name": "nneg", "type": ["null", "int"], "default": null, "doc": "number of negative pixels in a 5 x 5 pixel stamp"},
-	{"name": "nbad", "type": ["null", "int"], "default": null, "doc": "number of prior-tagged bad pixels in a 5 x 5 pixel stamp"},
-	{"name": "rb", "type": ["null", "float"], "default": null, "doc": "RealBogus quality score from Random Forest classifier; range is 0 to 1 where closer to 1 is more reliable"},
-	{"name": "ssdistnr", "type": ["null", "float"], "default": null, "doc": "distance to nearest known solar system object if exists within 30 arcsec [arcsec]"},
-	{"name": "ssmagnr", "type": ["null", "float"], "default": null, "doc": "magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]"},
-	{"name": "ssnamenr", "type": ["null", "string"], "default": null, "doc": "name of nearest known solar system object if exists within 30 arcsec (from MPC archive)"},
-	{"name": "sumrat", "type": ["null", "float"], "default": null, "doc": "Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers"},
-	{"name": "magapbig", "type": ["null", "float"], "default": null, "doc": "Aperture mag using 18 pixel diameter aperture [mag]"},
-	{"name": "sigmagapbig", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magapbig [mag]"},
-	{"name": "ranr", "type": "double", "doc": "Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]"},
-	{"name": "decnr", "type": "double", "doc": "Declination of nearest source in reference image PSF-catalog; J2000 [deg]"},
-	{"name": "sgmag1", "type": ["null", "float"], "default": null, "doc": "g-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "srmag1", "type": ["null", "float"], "default": null, "doc": "r-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "simag1", "type": ["null", "float"], "default": null, "doc": "i-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "szmag1", "type": ["null", "float"], "default": null, "doc": "z-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "sgscore1", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy score of closest source from PS1 catalog; if exists within 30 arcsec: 0 <= sgscore <= 1 where closer to 1 implies higher likelihood of being a star"},
-	{"name": "distpsnr1", "type": ["null", "float"], "default": null, "doc": "Distance to closest source from PS1 catalog; if exists within 30 arcsec [arcsec]"},
-	{"name": "ndethist", "type": "int", "doc": "Number of spatially-coincident detections falling within 1.5 arcsec going back to beginning of survey; only detections that fell on the same field and readout-channel ID where the input candidate was observed are counted"},
-	{"name": "ncovhist", "type": "int", "doc": "Number of times input candidate position fell on any field and readout-channel going back to beginning of survey"},
-	{"name": "jdstarthist", "type": ["null", "double"], "default": null, "doc": "Earliest Julian date of epoch corresponding to ndethist [days]"},
-	{"name": "jdendhist", "type": ["null", "double"], "default": null, "doc": "Latest Julian date of epoch corresponding to ndethist [days]"},
-	{"name": "scorr", "type": ["null", "double"], "default": null, "doc": "Peak-pixel signal-to-noise ratio in point source matched-filtered detection image"},
-	{"name": "tooflag", "type": ["null", "int"], "default": 0, "doc": "1 => candidate is from a Target-of-Opportunity (ToO) exposure; 0 => candidate is from a non-ToO exposure"},
-	{"name": "objectidps1", "type": ["null", "long"], "default": null, "doc": "Object ID of closest source from PS1 catalog; if exists within 30 arcsec"},
-	{"name": "objectidps2", "type": ["null", "long"], "default": null, "doc": "Object ID of second closest source from PS1 catalog; if exists within 30 arcsec"},
-	{"name": "sgmag2", "type": ["null", "float"], "default": null, "doc": "g-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "srmag2", "type": ["null", "float"], "default": null, "doc": "r-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "simag2", "type": ["null", "float"], "default": null, "doc": "i-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "szmag2", "type": ["null", "float"], "default": null, "doc": "z-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "sgscore2", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy score of second closest source from PS1 catalog; if exists within 30 arcsec: 0 <= sgscore <= 1 where closer to 1 implies higher likelihood of being a star"},
-	{"name": "distpsnr2", "type": ["null", "float"], "default": null, "doc": "Distance to second closest source from PS1 catalog; if exists within 30 arcsec [arcsec]"},
-	{"name": "objectidps3", "type": ["null", "long"], "default": null, "doc": "Object ID of third closest source from PS1 catalog; if exists within 30 arcsec"},
-	{"name": "sgmag3", "type": ["null", "float"], "default": null, "doc": "g-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "srmag3", "type": ["null", "float"], "default": null, "doc": "r-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "simag3", "type": ["null", "float"], "default": null, "doc": "i-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "szmag3", "type": ["null", "float"], "default": null, "doc": "z-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
-	{"name": "sgscore3", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy score of third closest source from PS1 catalog; if exists within 30 arcsec: 0 <= sgscore <= 1 where closer to 1 implies higher likelihood of being a star"},
-	{"name": "distpsnr3", "type": ["null", "float"], "default": null, "doc": "Distance to third closest source from PS1 catalog; if exists within 30 arcsec [arcsec]"},
-	{"name": "nmtchps", "type": "int", "doc": "Number of source matches from PS1 catalog falling within 30 arcsec"},
-	{"name": "rfid", "type": "long", "doc": "Processing ID for reference image to facilitate archive retrieval"},
-	{"name": "jdstartref", "type": "double", "doc": "Observation Julian date of earliest exposure used to generate reference image [days]"},
-	{"name": "jdendref", "type": "double", "doc": "Observation Julian date of latest exposure used to generate reference image [days]"},
-	{"name": "nframesref", "type": "int", "doc": "Number of frames (epochal images) used to generate reference image"},
-	{"name": "rbversion", "type": "string", "doc": "version of Random Forest classifier model used to assign RealBogus (rb) quality score"},
-	{"name": "dsnrms", "type": ["null", "float"], "default": null, "doc": "Ratio: D/stddev(D) on event position where D = difference image"},
-	{"name": "ssnrms", "type": ["null", "float"], "default": null, "doc": "Ratio: S/stddev(S) on event position where S = image of convolution: D (x) PSF(D)"},
-	{"name": "dsdiff", "type": ["null", "float"], "default": null, "doc": "Difference of statistics: dsnrms - ssnrms"},
-	{"name": "magzpsci", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point for photometry estimates [mag]"},
-	{"name": "magzpsciunc", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point uncertainty (in magzpsci) [mag]"},
-	{"name": "magzpscirms", "type": ["null", "float"], "default": null, "doc": "RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]"},
-	{"name": "nmatches", "type": "int", "doc": "Number of PS1 photometric calibrators used to calibrate science image from science image processing"},
-	{"name": "clrcoeff", "type": ["null", "float"], "default": null, "doc": "Color coefficient from linear fit from photometric calibration of science image"},
-	{"name": "clrcounc", "type": ["null", "float"], "default": null, "doc": "Color coefficient uncertainty from linear fit (corresponding to clrcoeff)"},
-	{"name": "zpclrcov", "type": ["null", "float"], "default": null, "doc": "Covariance in magzpsci and clrcoeff from science image processing [mag^2]"},
-	{"name": "zpmed", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point from median of all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]"},
-	{"name": "clrmed", "type": ["null", "float"], "default": null, "doc": "Median color of all PS1 photometric calibrators used from science image processing [mag]: for filter (fid) = 1, 2, 3, PS1 color used = g-r, g-r, r-i respectively"},
-	{"name": "clrrms", "type": ["null", "float"], "default": null, "doc": "RMS color (deviation from average) of all PS1 photometric calibrators used from science image processing [mag]"},
-	{"name": "neargaia", "type": ["null", "float"], "default": null, "doc": "Distance to closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [arcsec]"},
-	{"name": "neargaiabright", "type": ["null", "float"], "default": null, "doc": "Distance to closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [arcsec]"},
-	{"name": "maggaia", "type": ["null", "float"], "default": null, "doc": "Gaia (G-band) magnitude of closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [mag]"},
-	{"name": "maggaiabright", "type": ["null", "float"], "default": null, "doc": "Gaia (G-band) magnitude of closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [mag]"},
-	{"name": "exptime", "type": ["null", "float"], "default": null, "doc": "Integration time of camera exposure [sec]"},
-	{"name": "drb", "type": ["null", "float"], "default": null, "doc": "RealBogus quality score from Deep-Learning-based classifier; range is 0 to 1 where closer to 1 is more reliable"},
-	{"name": "drbversion", "type": "string", "doc": "version of Deep-Learning-based classifier model used to assign RealBogus (drb) quality score"}
-    ]
+	"namespace": "ztf.alert",
+	"name": "candidate",
+	"doc": "avro alert schema",
+	"version": "4.02",
+	"type": "record",
+	"fields": [
+		{"name": "jd", "type": "double", "doc": "Observation Julian date at start of exposure [days]"},
+		{"name": "fid", "type": "int", "doc": "Filter ID (1=g; 2=R; 3=i)"},
+		{"name": "pid", "type": "long", "doc": "Processing ID for science image to facilitate archive retrieval"},
+		{"name": "diffmaglim", "type": ["null", "float"], "default": null, "doc": "Expected 5-sigma mag limit in difference image based on global noise estimate [mag]"},
+		{"name": "pdiffimfilename", "type": ["null", "string"], "default": null, "doc": "filename of positive (sci minus ref) difference image"},
+		{"name": "programpi", "type": ["null", "string"], "default": null, "doc": "Principal investigator attached to program ID"},
+		{"name": "programid", "type": "int", "doc": "Program ID: encodes either public, collab, or caltech mode"},
+		{"name": "candid", "type": "long", "doc": "Candidate ID from operations DB"},
+		{"name": "isdiffpos", "type": "string", "doc": "t or 1 => candidate is from positive (sci minus ref) subtraction; f or 0 => candidate is from negative (ref minus sci) subtraction"},
+		{"name": "tblid", "type": ["null", "long"], "default": null, "doc": "Internal pipeline table extraction ID"},
+		{"name": "nid", "type": ["null", "int"], "default": null, "doc": "Night ID"},
+		{"name": "rcid", "type": ["null", "int"], "default": null, "doc": "Readout channel ID [00 .. 63]"},
+		{"name": "field", "type": ["null", "int"], "default": null, "doc": "ZTF field ID"},
+		{"name": "xpos", "type": ["null", "float"], "default": null, "doc": "x-image position of candidate [pixels]"},
+		{"name": "ypos", "type": ["null", "float"], "default": null, "doc": "y-image position of candidate [pixels]"},
+		{"name": "ra", "type": "double", "doc": "Right Ascension of candidate; J2000 [deg]"},
+		{"name": "dec", "type": "double", "doc": "Declination of candidate; J2000 [deg]"},
+		{"name": "magpsf", "type": "float", "doc": "Magnitude from PSF-fit photometry [mag]"},
+		{"name": "sigmapsf", "type": "float", "doc": "1-sigma uncertainty in magpsf [mag]"},
+		{"name": "chipsf", "type": ["null", "float"], "default": null, "doc": "Reduced chi-square for PSF-fit"},
+		{"name": "magap", "type": ["null", "float"], "default": null, "doc": "Aperture mag using 14 pixel diameter aperture [mag]"},
+		{"name": "sigmagap", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magap [mag]"},
+		{"name": "distnr", "type": ["null", "float"], "default": null, "doc": "distance to nearest source in reference image PSF-catalog [pixels]"},
+		{"name": "magnr", "type": ["null", "float"], "default": null, "doc": "magnitude of nearest source in reference image PSF-catalog [mag]"},
+		{"name": "sigmagnr", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magnr [mag]"},
+		{"name": "chinr", "type": ["null", "float"], "default": null, "doc": "DAOPhot chi parameter of nearest source in reference image PSF-catalog"},
+		{"name": "sharpnr", "type": ["null", "float"], "default": null, "doc": "DAOPhot sharp parameter of nearest source in reference image PSF-catalog"},
+		{"name": "sky", "type": ["null", "float"], "default": null, "doc": "Local sky background estimate [DN]"},
+		{"name": "magdiff", "type": ["null", "float"], "default": null, "doc": "Difference: magap - magpsf [mag]"},
+		{"name": "fwhm", "type": ["null", "float"], "default": null, "doc": "Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]"},
+		{"name": "classtar", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy classification score from SExtractor"},
+		{"name": "mindtoedge", "type": ["null", "float"], "default": null, "doc": "Distance to nearest edge in image [pixels]"},
+		{"name": "magfromlim", "type": ["null", "float"], "default": null, "doc": "Difference: diffmaglim - magap [mag]"},
+		{"name": "seeratio", "type": ["null", "float"], "default": null, "doc": "Ratio: difffwhm / fwhm"},
+		{"name": "aimage", "type": ["null", "float"], "default": null, "doc": "Windowed profile RMS afloat major axis from SExtractor [pixels]"},
+		{"name": "bimage", "type": ["null", "float"], "default": null, "doc": "Windowed profile RMS afloat minor axis from SExtractor [pixels]"},
+		{"name": "aimagerat", "type": ["null", "float"], "default": null, "doc": "Ratio: aimage / fwhm"},
+		{"name": "bimagerat", "type": ["null", "float"], "default": null, "doc": "Ratio: bimage / fwhm"},
+		{"name": "elong", "type": ["null", "float"], "default": null, "doc": "Ratio: aimage / bimage"},
+		{"name": "nneg", "type": ["null", "int"], "default": null, "doc": "number of negative pixels in a 5 x 5 pixel stamp"},
+		{"name": "nbad", "type": ["null", "int"], "default": null, "doc": "number of prior-tagged bad pixels in a 5 x 5 pixel stamp"},
+		{"name": "rb", "type": ["null", "float"], "default": null, "doc": "RealBogus quality score from Random Forest classifier; range is 0 to 1 where closer to 1 is more reliable"},
+		{"name": "ssdistnr", "type": ["null", "float"], "default": null, "doc": "distance to nearest known solar system object if exists within 30 arcsec [arcsec]"},
+		{"name": "ssmagnr", "type": ["null", "float"], "default": null, "doc": "magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]"},
+		{"name": "ssnamenr", "type": ["null", "string"], "default": null, "doc": "name of nearest known solar system object if exists within 30 arcsec (from MPC archive)"},
+		{"name": "sumrat", "type": ["null", "float"], "default": null, "doc": "Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers"},
+		{"name": "magapbig", "type": ["null", "float"], "default": null, "doc": "Aperture mag using 18 pixel diameter aperture [mag]"},
+		{"name": "sigmagapbig", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magapbig [mag]"},
+		{"name": "ranr", "type": "double", "doc": "Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]"},
+		{"name": "decnr", "type": "double", "doc": "Declination of nearest source in reference image PSF-catalog; J2000 [deg]"},
+		{"name": "sgmag1", "type": ["null", "float"], "default": null, "doc": "g-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "srmag1", "type": ["null", "float"], "default": null, "doc": "r-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "simag1", "type": ["null", "float"], "default": null, "doc": "i-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "szmag1", "type": ["null", "float"], "default": null, "doc": "z-band PSF-fit magnitude of closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "sgscore1", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy score of closest source from PS1 catalog; if exists within 30 arcsec: 0 <= sgscore <= 1 where closer to 1 implies higher likelihood of being a star"},
+		{"name": "distpsnr1", "type": ["null", "float"], "default": null, "doc": "Distance to closest source from PS1 catalog; if exists within 30 arcsec [arcsec]"},
+		{"name": "ndethist", "type": "int", "doc": "Number of spatially-coincident detections falling within 1.5 arcsec going back to beginning of survey; only detections that fell on the same field and readout-channel ID where the input candidate was observed are counted. All raw detections down to a photometric S/N of ~ 3 are included."},
+		{"name": "ncovhist", "type": "int", "doc": "Number of times input candidate position fell on any field and readout-channel going back to beginning of survey"},
+		{"name": "jdstarthist", "type": ["null", "double"], "default": null, "doc": "Earliest Julian date of epoch corresponding to ndethist [days]"},
+		{"name": "jdendhist", "type": ["null", "double"], "default": null, "doc": "Latest Julian date of epoch corresponding to ndethist [days]"},
+		{"name": "scorr", "type": ["null", "double"], "default": null, "doc": "Peak-pixel signal-to-noise ratio in point source matched-filtered detection image"},
+		{"name": "tooflag", "type": ["null", "int"], "default": null, "doc": "1 => candidate is from a Target-of-Opportunity (ToO) exposure; 0 => candidate is from a non-ToO exposure"},
+		{"name": "objectidps1", "type": ["null", "long"], "default": null, "doc": "Object ID of closest source from PS1 catalog; if exists within 30 arcsec"},
+		{"name": "objectidps2", "type": ["null", "long"], "default": null, "doc": "Object ID of second closest source from PS1 catalog; if exists within 30 arcsec"},
+		{"name": "sgmag2", "type": ["null", "float"], "default": null, "doc": "g-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "srmag2", "type": ["null", "float"], "default": null, "doc": "r-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "simag2", "type": ["null", "float"], "default": null, "doc": "i-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "szmag2", "type": ["null", "float"], "default": null, "doc": "z-band PSF-fit magnitude of second closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "sgscore2", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy score of second closest source from PS1 catalog; if exists within 30 arcsec: 0 <= sgscore <= 1 where closer to 1 implies higher likelihood of being a star"},
+		{"name": "distpsnr2", "type": ["null", "float"], "default": null, "doc": "Distance to second closest source from PS1 catalog; if exists within 30 arcsec [arcsec]"},
+		{"name": "objectidps3", "type": ["null", "long"], "default": null, "doc": "Object ID of third closest source from PS1 catalog; if exists within 30 arcsec"},
+		{"name": "sgmag3", "type": ["null", "float"], "default": null, "doc": "g-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "srmag3", "type": ["null", "float"], "default": null, "doc": "r-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "simag3", "type": ["null", "float"], "default": null, "doc": "i-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "szmag3", "type": ["null", "float"], "default": null, "doc": "z-band PSF-fit magnitude of third closest source from PS1 catalog; if exists within 30 arcsec [mag]"},
+		{"name": "sgscore3", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy score of third closest source from PS1 catalog; if exists within 30 arcsec: 0 <= sgscore <= 1 where closer to 1 implies higher likelihood of being a star"},
+		{"name": "distpsnr3", "type": ["null", "float"], "default": null, "doc": "Distance to third closest source from PS1 catalog; if exists within 30 arcsec [arcsec]"},
+		{"name": "nmtchps", "type": "int", "doc": "Number of source matches from PS1 catalog falling within 30 arcsec"},
+		{"name": "rfid", "type": "long", "doc": "Processing ID for reference image to facilitate archive retrieval"},
+		{"name": "jdstartref", "type": "double", "doc": "Observation Julian date of earliest exposure used to generate reference image [days]"},
+		{"name": "jdendref", "type": "double", "doc": "Observation Julian date of latest exposure used to generate reference image [days]"},
+		{"name": "nframesref", "type": "int", "doc": "Number of frames (epochal images) used to generate reference image"},
+		{"name": "rbversion", "type": "string", "doc": "version of Random Forest classifier model used to assign RealBogus (rb) quality score"},
+		{"name": "dsnrms", "type": ["null", "float"], "default": null, "doc": "Ratio: D/stddev(D) on event position where D = difference image"},
+		{"name": "ssnrms", "type": ["null", "float"], "default": null, "doc": "Ratio: S/stddev(S) on event position where S = image of convolution: D (x) PSF(D)"},
+		{"name": "dsdiff", "type": ["null", "float"], "default": null, "doc": "Difference of statistics: dsnrms - ssnrms"},
+		{"name": "magzpsci", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point for photometry estimates [mag]"},
+		{"name": "magzpsciunc", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point uncertainty (in magzpsci) [mag]"}, 
+		{"name": "magzpscirms", "type": ["null", "float"], "default": null, "doc": "RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]"}, 
+		{"name": "nmatches", "type": "int", "doc": "Number of PS1 photometric calibrators used to calibrate science image from science image processing"},
+		{"name": "clrcoeff", "type": ["null", "float"], "default": null, "doc": "Color coefficient from linear fit from photometric calibration of science image"}, 
+		{"name": "clrcounc", "type": ["null", "float"], "default": null, "doc": "Color coefficient uncertainty from linear fit (corresponding to clrcoeff)"},
+		{"name": "zpclrcov", "type": ["null", "float"], "default": null, "doc": "Covariance in magzpsci and clrcoeff from science image processing [mag^2]"},
+		{"name": "zpmed", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point from median of all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]"},
+		{"name": "clrmed", "type": ["null", "float"], "default": null, "doc": "Median color of all PS1 photometric calibrators used from science image processing [mag]: for filter (fid) = 1, 2, 3, PS1 color used = g-r, g-r, r-i respectively"},
+		{"name": "clrrms", "type": ["null", "float"], "default": null, "doc": "RMS color (deviation from average) of all PS1 photometric calibrators used from science image processing [mag]"},
+		{"name": "neargaia", "type": ["null", "float"], "default": null, "doc": "Distance to closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [arcsec]"},
+		{"name": "neargaiabright", "type": ["null", "float"], "default": null, "doc": "Distance to closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [arcsec]"},
+		{"name": "maggaia", "type": ["null", "float"], "default": null, "doc": "Gaia (G-band) magnitude of closest source from Gaia DR1 catalog irrespective of magnitude; if exists within 90 arcsec [mag]"},
+		{"name": "maggaiabright", "type": ["null", "float"], "default": null, "doc": "Gaia (G-band) magnitude of closest source from Gaia DR1 catalog brighter than magnitude 14; if exists within 90 arcsec [mag]"},
+		{"name": "exptime", "type": ["null", "float"], "default": null, "doc": "Integration time of camera exposure [sec]"},
+		{"name": "drb", "type": ["null", "float"], "default": null, "doc": "RealBogus quality score from Deep-Learning-based classifier; range is 0 to 1 where closer to 1 is more reliable"},
+		{"name": "drbversion", "type": "string", "doc": "version of Deep-Learning-based classifier model used to assign RealBogus (drb) quality score"}
+			]
 }
diff --git a/schema/schema-avro/cutout.avsc b/schema/schema-avro/cutout.avsc
index 43fe382..1891b34 100644
--- a/schema/schema-avro/cutout.avsc
+++ b/schema/schema-avro/cutout.avsc
@@ -3,7 +3,7 @@
 	"type": "record",
 	"name": "cutout",
 	"doc": "avro alert schema",
-	"version": "3.3",
+	"version": "4.02",
 	"fields": [
 		{"name": "fileName", "type": "string"},
 		{"name": "stampData", "type": "bytes", "doc": "fits.gz"}
diff --git a/schema/schema-avro/fp_hist.avsc b/schema/schema-avro/fp_hist.avsc
new file mode 100644
index 0000000..ba75ff7
--- /dev/null
+++ b/schema/schema-avro/fp_hist.avsc
@@ -0,0 +1,38 @@
+{
+	"namespace": "ztf.alert",
+	"name": "fp_hist",
+	"doc": "avro alert schema",
+	"version": "4.02",
+	"type": "record",
+	"fields": [
+                {"name": "field", "type": ["null", "int"], "default": null, "doc": "ZTF field ID"},
+		{"name": "rcid", "type": ["null", "int"], "default": null, "doc": "Readout channel ID [00 .. 63]"},
+		{"name": "fid", "type": "int", "doc": "Filter ID (1=g; 2=R; 3=i)"},
+		{"name": "pid", "type": "long", "doc": "Processing ID for image"},
+		{"name": "rfid", "type": "long", "doc": "Processing ID for reference image to facilitate archive retrieval"},
+		{"name": "sciinpseeing", "type": ["null", "float"], "default": null, "doc": "Effective FWHM of sci image [pixels]"},
+		{"name": "scibckgnd", "type": ["null", "float"], "default": null, "doc": "Background level in sci image [DN]"},
+		{"name": "scisigpix", "type": ["null", "float"], "default": null, "doc": "Robust sigma per pixel in sci image [DN]"},
+		{"name": "magzpsci", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point for photometry estimates [mag]"},
+		{"name": "magzpsciunc", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point uncertainty (in magzpsci) [mag]"},
+		{"name": "magzpscirms", "type": ["null", "float"], "default": null, "doc": "RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]"},
+		{"name": "clrcoeff", "type": ["null", "float"], "default": null, "doc": "Color coefficient from linear fit from photometric calibration of science image"},
+		{"name": "clrcounc", "type": ["null", "float"], "default": null, "doc": "Color coefficient uncertainty from linear fit (corresponding to clrcoeff)"},
+		{"name": "exptime", "type": ["null", "float"], "default": null, "doc": "Integration time of camera exposure [sec]"},
+		{"name": "adpctdif1", "type": ["null", "float"], "default": null, "doc": "Full sci image astrometric RMS along R.A. with respect to Gaia1 [arcsec]"},
+		{"name": "adpctdif2", "type": ["null", "float"], "default": null, "doc": "Full sci image astrometric RMS along Dec. with respect to Gaia1 [arcsec]"},
+		{"name": "diffmaglim", "type": ["null", "float"], "default": null, "doc": "Expected 5-sigma mag limit in difference image based on global noise estimate [mag]"},
+		{"name": "programid", "type": "int", "doc": "Program ID: encodes either public, collab, or caltech mode"},
+		{"name": "jd", "type": "double", "doc": "Observation Julian date at start of exposure [days]"},
+		{"name": "forcediffimflux", "type": ["null", "float"], "default": null, "doc": "Forced difference image PSF-fit flux [DN]"},
+		{"name": "forcediffimfluxunc", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in forcediffimflux [DN]"},
+		{"name": "procstatus", "type": ["null", "string"], "default": null, "doc": "Forced photometry processing status codes (0 => no warnings); see documentation"},
+		{"name": "distnr", "type": ["null", "float"], "default": null, "doc": "distance to nearest source in reference image PSF-catalog [arcsec]"},
+		{"name": "ranr", "type": "double", "doc": "Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]"},
+		{"name": "decnr", "type": "double", "doc": "Declination of nearest source in reference image PSF-catalog; J2000 [deg]"},
+		{"name": "magnr", "type": ["null", "float"], "default": null, "doc": "magnitude of nearest source in reference image PSF-catalog [mag]"},
+		{"name": "sigmagnr", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magnr [mag]"},
+		{"name": "chinr", "type": ["null", "float"], "default": null, "doc": "DAOPhot chi parameter of nearest source in reference image PSF-catalog"},
+		{"name": "sharpnr", "type": ["null", "float"], "default": null, "doc": "DAOPhot sharp parameter of nearest source in reference image PSF-catalog"}
+			]
+}
diff --git a/schema/schema-avro/prv_candidate.avsc b/schema/schema-avro/prv_candidate.avsc
index 2e44245..4565cfe 100644
--- a/schema/schema-avro/prv_candidate.avsc
+++ b/schema/schema-avro/prv_candidate.avsc
@@ -2,65 +2,65 @@
 	"namespace": "ztf.alert",
 	"name": "prv_candidate",
 	"doc": "avro alert schema",
-	"version": "3.3",
+	"version": "4.02",
 	"type": "record",
 	"fields": [
 		{"name": "jd", "type": "double", "doc": "Observation Julian date at start of exposure [days]"},
 		{"name": "fid", "type": "int", "doc": "Filter ID (1=g; 2=R; 3=i)"},
 		{"name": "pid", "type": "long", "doc": "Processing ID for image"},
-	    {"name": "diffmaglim", "type": ["null", "float"], "default": null, "doc": "Expected 5-sigma mag limit in difference image based on global noise estimate [mag]"},
-	    {"name": "pdiffimfilename", "type": ["null", "string"], "default": null, "doc": "filename of positive (sci minus ref) difference image"},
-	    {"name": "programpi", "type": ["null", "string"], "default": null, "doc": "Principal investigator attached to program ID"},
+		{"name": "diffmaglim", "type": ["null", "float"], "default": null, "doc": "Expected 5-sigma mag limit in difference image based on global noise estimate [mag]"},
+		{"name": "pdiffimfilename", "type": ["null", "string"], "default": null, "doc": "filename of positive (sci minus ref) difference image"},
+		{"name": "programpi", "type": ["null", "string"], "default": null, "doc": "Principal investigator attached to program ID"},
 		{"name": "programid", "type": "int", "doc": "Program ID: encodes either public, collab, or caltech mode"},
-	    {"name": "candid", "type": ["null", "long"], "doc": "Candidate ID from operations DB"},
-	    {"name": "isdiffpos", "type": ["null", "string"], "doc": "t or 1 => candidate is from positive (sci minus ref) subtraction; f or 0 => candidate is from negative (ref minus sci) subtraction"},
-	    {"name": "tblid", "type": ["null", "long"], "default": null, "doc": "Internal pipeline table extraction ID"},
-	    {"name": "nid", "type": ["null", "int"], "default": null, "doc": "Night ID"},
-	    {"name": "rcid", "type": ["null", "int"], "default": null, "doc": "Readout channel ID [00 .. 63]"},
-	    {"name": "field", "type": ["null", "int"], "default": null, "doc": "ZTF field ID"},
-	    {"name": "xpos", "type": ["null", "float"], "default": null, "doc": "x-image position of candidate [pixels]"},
-	    {"name": "ypos", "type": ["null", "float"], "default": null, "doc": "y-image position of candidate [pixels]"},
-	    {"name": "ra", "type": ["null", "double"], "doc": "Right Ascension of candidate; J2000 [deg]"},
-	    {"name": "dec", "type": ["null", "double"], "doc": "Declination of candidate; J2000 [deg]"},
-	    {"name": "magpsf", "type": ["null", "float"], "doc": "Magnitude from PSF-fit photometry [mag]"},
-	    {"name": "sigmapsf", "type": ["null", "float"], "doc": "1-sigma uncertainty in magpsf [mag]"},
-	    {"name": "chipsf", "type": ["null", "float"], "default": null, "doc": "Reduced chi-square for PSF-fit"},
-	    {"name": "magap", "type": ["null", "float"], "default": null, "doc": "Aperture mag using 14 pixel diameter aperture [mag]"},
-	    {"name": "sigmagap", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magap [mag]"},
-	    {"name": "distnr", "type": ["null", "float"], "default": null, "doc": "distance to nearest source in reference image PSF-catalog [pixels]"},
-	    {"name": "magnr", "type": ["null", "float"], "default": null, "doc": "magnitude of nearest source in reference image PSF-catalog [mag]"},
-	    {"name": "sigmagnr", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magnr [mag]"},
-	    {"name": "chinr", "type": ["null", "float"], "default": null, "doc": "DAOPhot chi parameter of nearest source in reference image PSF-catalog"},
-	    {"name": "sharpnr", "type": ["null", "float"], "default": null, "doc": "DAOPhot sharp parameter of nearest source in reference image PSF-catalog"},
-	    {"name": "sky", "type": ["null", "float"], "default": null, "doc": "Local sky background estimate [DN]"},
-	    {"name": "magdiff", "type": ["null", "float"], "default": null, "doc": "Difference: magap - magpsf [mag]"},
-	    {"name": "fwhm", "type": ["null", "float"], "default": null, "doc": "Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]"},
-	    {"name": "classtar", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy classification score from SExtractor"},
-	    {"name": "mindtoedge", "type": ["null", "float"], "default": null, "doc": "Distance to nearest edge in image [pixels]"},
-	    {"name": "magfromlim", "type": ["null", "float"], "default": null, "doc": "Difference: diffmaglim - magap [mag]"},
-	    {"name": "seeratio", "type": ["null", "float"], "default": null, "doc": "Ratio: difffwhm / fwhm"},
-	    {"name": "aimage", "type": ["null", "float"], "default": null, "doc": "Windowed profile RMS afloat major axis from SExtractor [pixels]"},
-	    {"name": "bimage", "type": ["null", "float"], "default": null, "doc": "Windowed profile RMS afloat minor axis from SExtractor [pixels]"},
-	    {"name": "aimagerat", "type": ["null", "float"], "default": null, "doc": "Ratio: aimage / fwhm"},
-	    {"name": "bimagerat", "type": ["null", "float"], "default": null, "doc": "Ratio: bimage / fwhm"},
-	    {"name": "elong", "type": ["null", "float"], "default": null, "doc": "Ratio: aimage / bimage"},
-	    {"name": "nneg", "type": ["null", "int"], "default": null, "doc": "number of negative pixels in a 5 x 5 pixel stamp"},
-	    {"name": "nbad", "type": ["null", "int"], "default": null, "doc": "number of prior-tagged bad pixels in a 5 x 5 pixel stamp"},
-	    {"name": "rb", "type": ["null", "float"], "default": null, "doc": "RealBogus quality score; range is 0 to 1 where closer to 1 is more reliable"},
-	    {"name": "ssdistnr", "type": ["null", "float"], "default": null, "doc": "distance to nearest known solar system object if exists within 30 arcsec [arcsec]"},
-	    {"name": "ssmagnr", "type": ["null", "float"], "default": null, "doc": "magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]"},
-	    {"name": "ssnamenr", "type": ["null", "string"], "default": null, "doc": "name of nearest known solar system object if exists within 30 arcsec (from MPC archive)"},
-	    {"name": "sumrat", "type": ["null", "float"], "default": null, "doc": "Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers"},
-	    {"name": "magapbig", "type": ["null", "float"], "default": null, "doc": "Aperture mag using 18 pixel diameter aperture [mag]"},
-	    {"name": "sigmagapbig", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magapbig [mag]"},
-	    {"name": "ranr", "type": ["null", "double"], "doc": "Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]"},
-	    {"name": "decnr", "type": ["null", "double"], "doc": "Declination of nearest source in reference image PSF-catalog; J2000 [deg]"},
-	    {"name": "scorr", "type": ["null", "double"], "default": null, "doc": "Peak-pixel signal-to-noise ratio in point source matched-filtered detection image"},
-	    {"name": "magzpsci", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point for photometry estimates [mag]"},
-	    {"name": "magzpsciunc", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point uncertainty (in magzpsci) [mag]"},
-	    {"name": "magzpscirms", "type": ["null", "float"], "default": null, "doc": "RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]"},
-	    {"name": "clrcoeff", "type": ["null", "float"], "default": null, "doc": "Color coefficient from linear fit from photometric calibration of science image"},
-	    {"name": "clrcounc", "type": ["null", "float"], "default": null, "doc": "Color coefficient uncertainty from linear fit (corresponding to clrcoeff)"},
+		{"name": "candid", "type": ["null", "long"], "doc": "Candidate ID from operations DB"},
+		{"name": "isdiffpos", "type": ["null", "string"], "doc": "t or 1 => candidate is from positive (sci minus ref) subtraction; f or 0 => candidate is from negative (ref minus sci) subtraction"},
+		{"name": "tblid", "type": ["null", "long"], "default": null, "doc": "Internal pipeline table extraction ID"},
+		{"name": "nid", "type": ["null", "int"], "default": null, "doc": "Night ID"},
+		{"name": "rcid", "type": ["null", "int"], "default": null, "doc": "Readout channel ID [00 .. 63]"},
+		{"name": "field", "type": ["null", "int"], "default": null, "doc": "ZTF field ID"},
+		{"name": "xpos", "type": ["null", "float"], "default": null, "doc": "x-image position of candidate [pixels]"},
+		{"name": "ypos", "type": ["null", "float"], "default": null, "doc": "y-image position of candidate [pixels]"},
+		{"name": "ra", "type": ["null", "double"], "doc": "Right Ascension of candidate; J2000 [deg]"},
+		{"name": "dec", "type": ["null", "double"], "doc": "Declination of candidate; J2000 [deg]"},
+		{"name": "magpsf", "type": ["null", "float"], "doc": "Magnitude from PSF-fit photometry [mag]"},
+		{"name": "sigmapsf", "type": ["null", "float"], "doc": "1-sigma uncertainty in magpsf [mag]"},
+		{"name": "chipsf", "type": ["null", "float"], "default": null, "doc": "Reduced chi-square for PSF-fit"},
+		{"name": "magap", "type": ["null", "float"], "default": null, "doc": "Aperture mag using 14 pixel diameter aperture [mag]"},
+		{"name": "sigmagap", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magap [mag]"},
+		{"name": "distnr", "type": ["null", "float"], "default": null, "doc": "distance to nearest source in reference image PSF-catalog [pixels]"},
+		{"name": "magnr", "type": ["null", "float"], "default": null, "doc": "magnitude of nearest source in reference image PSF-catalog [mag]"},
+		{"name": "sigmagnr", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magnr [mag]"},
+		{"name": "chinr", "type": ["null", "float"], "default": null, "doc": "DAOPhot chi parameter of nearest source in reference image PSF-catalog"},
+		{"name": "sharpnr", "type": ["null", "float"], "default": null, "doc": "DAOPhot sharp parameter of nearest source in reference image PSF-catalog"},
+		{"name": "sky", "type": ["null", "float"], "default": null, "doc": "Local sky background estimate [DN]"},
+		{"name": "magdiff", "type": ["null", "float"], "default": null, "doc": "Difference: magap - magpsf [mag]"},
+		{"name": "fwhm", "type": ["null", "float"], "default": null, "doc": "Full Width Half Max assuming a Gaussian core, from SExtractor [pixels]"},
+		{"name": "classtar", "type": ["null", "float"], "default": null, "doc": "Star/Galaxy classification score from SExtractor"},
+		{"name": "mindtoedge", "type": ["null", "float"], "default": null, "doc": "Distance to nearest edge in image [pixels]"},
+		{"name": "magfromlim", "type": ["null", "float"], "default": null, "doc": "Difference: diffmaglim - magap [mag]"},
+		{"name": "seeratio", "type": ["null", "float"], "default": null, "doc": "Ratio: difffwhm / fwhm"},
+		{"name": "aimage", "type": ["null", "float"], "default": null, "doc": "Windowed profile RMS afloat major axis from SExtractor [pixels]"},
+		{"name": "bimage", "type": ["null", "float"], "default": null, "doc": "Windowed profile RMS afloat minor axis from SExtractor [pixels]"},
+		{"name": "aimagerat", "type": ["null", "float"], "default": null, "doc": "Ratio: aimage / fwhm"},
+		{"name": "bimagerat", "type": ["null", "float"], "default": null, "doc": "Ratio: bimage / fwhm"},
+		{"name": "elong", "type": ["null", "float"], "default": null, "doc": "Ratio: aimage / bimage"},
+		{"name": "nneg", "type": ["null", "int"], "default": null, "doc": "number of negative pixels in a 5 x 5 pixel stamp"},
+		{"name": "nbad", "type": ["null", "int"], "default": null, "doc": "number of prior-tagged bad pixels in a 5 x 5 pixel stamp"},
+		{"name": "rb", "type": ["null", "float"], "default": null, "doc": "RealBogus quality score; range is 0 to 1 where closer to 1 is more reliable"},
+		{"name": "ssdistnr", "type": ["null", "float"], "default": null, "doc": "distance to nearest known solar system object if exists within 30 arcsec [arcsec]"},
+		{"name": "ssmagnr", "type": ["null", "float"], "default": null, "doc": "magnitude of nearest known solar system object if exists within 30 arcsec (usually V-band from MPC archive) [mag]"},
+		{"name": "ssnamenr", "type": ["null", "string"], "default": null, "doc": "name of nearest known solar system object if exists within 30 arcsec (from MPC archive)"},
+		{"name": "sumrat", "type": ["null", "float"], "default": null, "doc": "Ratio: sum(pixels) / sum(|pixels|) in a 5 x 5 pixel stamp where stamp is first median-filtered to mitigate outliers"},
+		{"name": "magapbig", "type": ["null", "float"], "default": null, "doc": "Aperture mag using 18 pixel diameter aperture [mag]"},
+		{"name": "sigmagapbig", "type": ["null", "float"], "default": null, "doc": "1-sigma uncertainty in magapbig [mag]"},
+		{"name": "ranr", "type": ["null", "double"], "doc": "Right Ascension of nearest source in reference image PSF-catalog; J2000 [deg]"},
+		{"name": "decnr", "type": ["null", "double"], "doc": "Declination of nearest source in reference image PSF-catalog; J2000 [deg]"},
+		{"name": "scorr", "type": ["null", "double"], "default": null, "doc": "Peak-pixel signal-to-noise ratio in point source matched-filtered detection image"},
+		{"name": "magzpsci", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point for photometry estimates [mag]"},
+		{"name": "magzpsciunc", "type": ["null", "float"], "default": null, "doc": "Magnitude zero point uncertainty (in magzpsci) [mag]"},
+		{"name": "magzpscirms", "type": ["null", "float"], "default": null, "doc": "RMS (deviation from average) in all differences between instrumental photometry and matched photometric calibrators from science image processing [mag]"},
+		{"name": "clrcoeff", "type": ["null", "float"], "default": null, "doc": "Color coefficient from linear fit from photometric calibration of science image"},
+		{"name": "clrcounc", "type": ["null", "float"], "default": null, "doc": "Color coefficient uncertainty from linear fit (corresponding to clrcoeff)"},
 		{"name": "rbversion", "type": "string", "doc": "version of RealBogus model/classifier used to assign rb quality score"}
 			]
 }
diff --git a/schema/union_null_array_fp_hist.go b/schema/union_null_array_fp_hist.go
new file mode 100644
index 0000000..271a7ce
--- /dev/null
+++ b/schema/union_null_array_fp_hist.go
@@ -0,0 +1,92 @@
+// Code generated by github.com/actgardner/gogen-avro. DO NOT EDIT.
+/*
+ * SOURCES:
+ *     alert.avsc
+ *     candidate.avsc
+ *     cutout.avsc
+ *     fp_hist.avsc
+ *     prv_candidate.avsc
+ */
+package schema
+
+import (
+	"io"
+	"fmt"
+
+	"github.com/actgardner/gogen-avro/vm"
+	"github.com/actgardner/gogen-avro/vm/types"
+)
+
+
+type UnionNullArrayFp_histTypeEnum int
+const (
+
+	 UnionNullArrayFp_histTypeEnumNull UnionNullArrayFp_histTypeEnum = 0
+
+	 UnionNullArrayFp_histTypeEnumArrayFp_hist UnionNullArrayFp_histTypeEnum = 1
+
+)
+
+type UnionNullArrayFp_hist struct {
+
+	Null *types.NullVal
+
+	ArrayFp_hist []*Fp_hist
+
+	UnionType UnionNullArrayFp_histTypeEnum
+}
+
+func writeUnionNullArrayFp_hist(r *UnionNullArrayFp_hist, w io.Writer) error {
+	err := vm.WriteLong(int64(r.UnionType), w)
+	if err != nil {
+		return err
+	}
+	switch r.UnionType{
+	
+	case UnionNullArrayFp_histTypeEnumNull:
+		return vm.WriteNull(r.Null, w)
+        
+	case UnionNullArrayFp_histTypeEnumArrayFp_hist:
+		return writeArrayFp_hist(r.ArrayFp_hist, w)
+        
+	}
+	return fmt.Errorf("invalid value for *UnionNullArrayFp_hist")
+}
+
+func NewUnionNullArrayFp_hist() *UnionNullArrayFp_hist {
+	return &UnionNullArrayFp_hist{}
+}
+
+func (_ *UnionNullArrayFp_hist) SetBoolean(v bool) { panic("Unsupported operation") }
+func (_ *UnionNullArrayFp_hist) SetInt(v int32) { panic("Unsupported operation") }
+func (_ *UnionNullArrayFp_hist) SetFloat(v float32) { panic("Unsupported operation") }
+func (_ *UnionNullArrayFp_hist) SetDouble(v float64) { panic("Unsupported operation") }
+func (_ *UnionNullArrayFp_hist) SetBytes(v []byte) { panic("Unsupported operation") }
+func (_ *UnionNullArrayFp_hist) SetString(v string) { panic("Unsupported operation") }
+func (r *UnionNullArrayFp_hist) SetLong(v int64) { 
+	r.UnionType = (UnionNullArrayFp_histTypeEnum)(v)
+}
+func (r *UnionNullArrayFp_hist) Get(i int) types.Field {
+	switch (i) {
+	
+	case 0:
+		
+		
+		return r.Null
+		
+	
+	case 1:
+		
+		r.ArrayFp_hist = make([]*Fp_hist, 0)
+		
+		
+		return (*ArrayFp_histWrapper)(&r.ArrayFp_hist)
+		
+	
+	}
+	panic("Unknown field index")
+}
+func (_ *UnionNullArrayFp_hist) SetDefault(i int) { panic("Unsupported operation") }
+func (_ *UnionNullArrayFp_hist) AppendMap(key string) types.Field { panic("Unsupported operation") }
+func (_ *UnionNullArrayFp_hist) AppendArray() types.Field { panic("Unsupported operation") }
+func (_ *UnionNullArrayFp_hist) Finalize()  { }
diff --git a/schema/union_null_array_prv_candidate.go b/schema/union_null_array_prv_candidate.go
index 089fde6..1544c83 100644
--- a/schema/union_null_array_prv_candidate.go
+++ b/schema/union_null_array_prv_candidate.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/union_null_cutout.go b/schema/union_null_cutout.go
index 32a9689..3b87c2f 100644
--- a/schema/union_null_cutout.go
+++ b/schema/union_null_cutout.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/union_null_double.go b/schema/union_null_double.go
index 04dfff6..8f1c2b3 100644
--- a/schema/union_null_double.go
+++ b/schema/union_null_double.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/union_null_float.go b/schema/union_null_float.go
index f172cbb..66b04ff 100644
--- a/schema/union_null_float.go
+++ b/schema/union_null_float.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/union_null_int.go b/schema/union_null_int.go
index b383b17..5dacf0c 100644
--- a/schema/union_null_int.go
+++ b/schema/union_null_int.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/union_null_long.go b/schema/union_null_long.go
index d8a4f51..a58031b 100644
--- a/schema/union_null_long.go
+++ b/schema/union_null_long.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema
diff --git a/schema/union_null_string.go b/schema/union_null_string.go
index b25cc12..43fda05 100644
--- a/schema/union_null_string.go
+++ b/schema/union_null_string.go
@@ -4,6 +4,7 @@
  *     alert.avsc
  *     candidate.avsc
  *     cutout.avsc
+ *     fp_hist.avsc
  *     prv_candidate.avsc
  */
 package schema