| 2025-01-14 |
hst_1205.pmap |
latest |
This update provides new WFC3 UVIS superdarks and a bad pixel table. The superdarks will affect all UVIS data taken from December 3, 2024 to January 1, 2025, and the bad pixel table applies to data taken between December 3, 2024, through January 4, 2025. The automated pipeline should now use these reference files to perform dark subtraction on any UVIS datasets obtained between the dates above, as they represent the most accurate picture of dark current, hot pixels, and pixel stability for this time period. These WFC3 UVIS drk and dkc files were generated using dark exposures from HST Cycle 32 CAL programs 17665 and 17667. More information regarding the method used to create the UVIS dark calibration reference files can be found in WFC3 ISR 2016-08. Additionally, the header of each reference file contains a detailed history section outlining the process, and provides a list of data used to create each file. The bad pixel files were generated using 900 second dark exposures from the HST cycle 32 daily monitoring programs 17665 and 17667. More information about the UVIS bad pixel tables is outlined in the WFC3 ISR 2018.15 and WFC3 ISR 2021.14. |
| 2025-01-06 |
hst_1203.pmap |
archived |
Delivery of new STIS CCD bias and dark reference files for CCD data taken between November 27 and December 26, 2024. The files were generated from data taken in the same time frame under STIS calibration programs 17632 and 17629. |
| 2024-12-17 |
hst_1202.pmap |
archived |
A new ACS PCTETAB reference file is being delivered, because serial CTE correction is included in CALACS v10.4.0. This new PCTETAB contains the parameters for serial CTE correction along with the existing parallel correction parameters. This is the first delivery of a time-dependent photometry lookup table for WFC3/IR. New IR inverse sensitivities incorporate updated CALSPEC models and include corrections for temporal changes in the detector sensitivity derived from 14 years of monitoring data, as described in Marinelli et al. 2024, WFC3 ISR 2024 06. The automated calibration pipeline, calwf3 v3.7.2 or later, now implements a time dependent IMPHTTAB for IR, so the image header inverse sensitivity keyword, PHOTFLAM, accounts for sensitivity losses of about 0.1 0.2 percent per year, depending on filter. These new inverse sensitivities provide an internal photometric precision better than 0.5 percent for all wide, medium, and narrow band filters, as discussed in Calamida et al. 2024, New Time-Dependent WFC3/IR Inverse Sensitivities. For compatibility purposes, the MJD value arrays contain the previously published inverse sensitivities as a constant. |
| 2024-12-12 |
hst_1200.pmap |
archived |
These WFC3 UVIS superdarks will affect all UVIS data taken from November 4, 2024 to November 30, 2024. Currently, the automated calibration pipeline and CRDS have only WFC3 UVIS drk and dkc reference files with USEAFTER dates of up to October 31, 2024. The automated pipeline should now use these reference files to perform dark subtraction on any UVIS datasets obtained between the dates above, as they represent the most accurate picture of dark current and hot pixels for this time period. These WFC3 UVIS drk and dkc files were generated using dark exposures from HST Cycle 31 CAL program 17349, and HST Cycle 32 CAL Program 17667. More information regarding the method used to create the UVIS dark calibration reference files can be found in WFC3 ISR 2016-08. Additionally, the header of each reference file contains a detailed history section outlining the process, and provides a list of data used to create each file. |