Two problematic tiles on 20241220

[schlafly]

The first case is after a long slew from a high airmass test tile and so probably fits into the same category as #247 . The second is at low dec and immediately precedes movement to the NGC, and was observed at airmass 1.9. It was split and the split failed with a large split move. I suspect that this is saying that we were ~off target during the second half of this observation, and somehow differently in the different petals, resulting in the reported THRUFRAC variations. We should probably throw both of these out.

I think we could solve the second case with more frequent splits on these tiles, while we still don't really understand the first case, though focus errors reported by Klaus remain my preferred hypothesis.

I'll mark both of these unsure for now.
20241220, expid 269285 on tileid 5776
20241220, expid 269294 on tileid 10655

[geordie666]

@abhi0395: Could you mark these exposures as bad and reprocess, please?

[abhi0395]

@geordie666: I have marked Exposures 269285 (tileid: 5776) and 269294 (tileid: 10655) as bad and reprocessed them; tsnr and nightqa have been updated. Please verify and close the ticket if things look okay.

[geordie666]

Thanks, @abhi0395. Looks good. I've updated the tile QA, etc. and I'm closing this ticket.