The list of Investigators does not match the STScI records for this program. FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser First submission. 432170194 ----- Attempting Submission 1 (Mon Dec 13 19:06:45 GMT 2021) ----- 1) Co-I added (this cal program wasn't created with co-I's) 2) Flash levels are deliberately set to probe background variation. WFC3/ISR 2021-13 constructed table-based CTE corrections for photometry and astrometry for backgrounds between 5e and 30e. The astrometric corrections in that ISR were somewhat ad hoc, since the calibration observations were not optimized for astrometry (there were degeneracies at the bright-star end). In this two-orbit program, we will (1) provide photometric corrections all the way up to 100e background, and (2) we will provide explicit astrometric corrections for all background levels, from 10e to 100e. We will use the data collected in this program to update the table-based correction. We will put together a quick ISR to present the analysis and construct the table. This program will involve one two-orbit visit. We will observe the center of Omega Centauri, taking advantage of its flat spatial distribution and its bottom-heavy brightness distribution. The observations will be taken in F502N, which allows efficient 339s exposures to get ~300 stars in the brightest unsaturated magnitude bin, 8000 stars in the S/N~100 magnitude bin, and 20,000 stars in the faint S/N~10 magnitude bin. We can get 6 such exposures per orbit, for a total of 12 exposures in the program. The natural background of these exposures should be about 10e. We will take 4 exposures with a background of ~60e to provide the photometric and astrometric reference catalogs against which the other background will be measured: (1) one with the null post-targ (centered on the cluster), (2) one with a 1-chip dither upwards in y, (3) one with a -1-chip dither downwards in y, and another with a +0.5 chip dither upwards in y. The two full-dithered steps will allow us to calibrate directly the CTE-related photometric losses in both chips. From this, we will produce an acccurate photometric catalog of all the stars in both chips of the default pointing. The half-chip stepped exposures will allow assessment of the astrometic component of imperfect CTE, which shifts the apparent positions of stars away from the readout register (ie, towards the gap). Since we can get 6 exposures per orbit and 12 total, this leaves us 8 exposures to probe additional backgrounds. We will take one with no postflash, which should probe a background of 10e (thanks to the cluster background), then we'll add 0.1s of MEDIUM current to get 17e, 24e, 31e, 38e, 45e, 52e, (59e), 73e, 80e, and 101e. 0 false false RESTRICTED EXT-CLUSTER GLOBULAR CLUSTER This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 1636670436226 /Users/jayander/Desktop/OP-cache/APT_CAL16862_EXTOMC-v01.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. 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