Time-dependent WFC3/IR Superdarks
Abstract
We create new WFC3/IR dark calibration files for all allowed observing modes. Unlike previous superdark releases, we update the values of any time-dependent pixels in these new superdarks on a cycle-by-cycle basis, which allows for better calibration of those 3.5% of detector pixels that have changed their dark current behavior since launch. These new superdarks also incorporate an additional four years of dark calibration data since the previous release, which reduces the errors associated with the superdark values by 8.9-67% depending on the observing mode. These new superdarks have been delivered and incorporated into the calwf3 pipeline (3562*drk.fits) along with the new accompanying time-dependent WFC3/IR bad pixel tables (Sunnquist et al., 2019). For drizzled data products, a new AstroDrizzle parameter table should be used together with these new reference files in order to recover the stable hot pixels (Mack & Bajaj, 2019).
- Publication:
-
Space Telescope WFC Instrument Science Report
- Pub Date:
- May 2019
- Bibcode:
- 2019wfc..rept....4S
- Keywords:
-
- Hubble Space Telescope;
- HST;
- Space Telescope Science Institute;
- STScI;
- WFC3;
- Wide Field Camera 3;
- IR;
- Darks;
- Calibration