Tile 3395 is currently marked as unsure due to thrufrac alerts related to low exposure time as can clearly be seen on the attached QA sheet.
Additional information shared on slack by Anand:
the two exposures are 247522-3, taken from 00:06 to 00:48:
247524 4951 SCIENCE 00:48 1266.3 DARK 0-9 ok ok ok ok ok - -
247523 3395 SCIENCE 00:28 1112.8 DARK 0-9 ok ok ok ok ok - -
247522 3395 SCIENCE 00:06 1208.8 DARK 0-9 ok ok ok ok ok - -
the nightlog mentions clouds:
00:06 [07:06] Exp. 247522- Good - First SPLIT of the tenth DARK tile 3395, correction move: 3.4 micron, Survey speed variable between 30% and 80% as fine clouds pass through, no issues with the data. (SO)
Tile 3395, Exptime: 1208.78, Airmass: 1.10, Sequence: DESI, Flavor: science, Program: DARK
00:28 [07:28] Exp. 247523- Good - Second SPLIT of the tenth DARK tile 3395, correction move: 3.4 micron, Survey speed up to 80% again, no issues with the data. (SO)
Tile 3395, Exptime: 1112.81, Airmass: 1.08, Sequence: _Split, Flavor: science, Program: DARK
the grafana plots for transparency + survey speed show a drop at that time (attached screenshot)if useful, here are the b/r/z thrufrac values for the two exposures:
I have marked exposures 00247522 and 00247523 on 20240811 as bad and purged all the data for tile 3395 on that night. It has not been observed since, so there was no reprocessing to do.
Tile 3395 is currently marked as unsure due to thrufrac alerts related to low exposure time as can clearly be seen on the attached QA sheet.
Additional information shared on slack by Anand: the two exposures are 247522-3, taken from 00:06 to 00:48:
247524 4951 SCIENCE 00:48 1266.3 DARK 0-9 ok ok ok ok ok - - 247523 3395 SCIENCE 00:28 1112.8 DARK 0-9 ok ok ok ok ok - - 247522 3395 SCIENCE 00:06 1208.8 DARK 0-9 ok ok ok ok ok - -
the nightlog mentions clouds:
00:06 [07:06] Exp. 247522- Good - First SPLIT of the tenth DARK tile 3395, correction move: 3.4 micron, Survey speed variable between 30% and 80% as fine clouds pass through, no issues with the data. (SO) Tile 3395, Exptime: 1208.78, Airmass: 1.10, Sequence: DESI, Flavor: science, Program: DARK
00:28 [07:28] Exp. 247523- Good - Second SPLIT of the tenth DARK tile 3395, correction move: 3.4 micron, Survey speed up to 80% again, no issues with the data. (SO) Tile 3395, Exptime: 1112.81, Airmass: 1.08, Sequence: _Split, Flavor: science, Program: DARK
the grafana plots for transparency + survey speed show a drop at that time (attached screenshot)if useful, here are the b/r/z thrufrac values for the two exposures: