CalDB 4.12.1 Public Release Notes
SDP Installation Date: 2025-06-09T14:00:00 (UTC)
NOTICE: CalDB 4.12.1 will not be released to the public until a later release.
I. INTRODUCTION
CalDB 4.12.1 is an upgrade to the Chandra CalDB, which includes the following items:
II. SUMMARY OF CHANGES
A. PCAD ACA-P DARK_CURR Update #10
| Location: | $CALDB/data/chandra/pcad/dark_curr/ |
| Filenames: | acapD2024-12-10darkN0002.fits acapD2025-01-19darkN0002.fits acapD2025-02-11darkN0002.fits acapD2025-03-13darkN0002.fits acapD2025-04-11darkN0002.fits |
The CXC Aspect Team has generated a tenth set of ACAP DARK_CURR files, including five new files, to support ACA background calculation and subtraction in the ASPECT L1 pipeline. The DARK_CURR files draw on an ever-growing database of ACA full field dark current data products which have been accumulated since the 1999:223 OAC dark current pixel map. Each version N0002 dark current fits file in the CALDB includes a 1024x1024 image with the processed full-field dark current map of the ACA CCD in e-/sec. Each file also includes header information with the ACA CCD temperature of the calibration, the reference date of the ACA dark current product, and the scale expected to be used to scale the calibration e-/sec to the effective e-/sec at the observed temperatures during observations.
The DARK_CURR files have effective dates (Cal Validity Start Date, or CVSD*) which are spaced ~2-6 weeks apart, as with their previously released datasets. The new files are effective as of the respective dates given in the filnames in the Description of Change section below. These new files extend the date coverage for archival observations through 2025-04-11T00:00:00, with the final file being the one that will be the default file in standard data processing (SDP) until the next release/extension.
PIPELINES/TOOLS AFFECTED:
PCAD L1 Pipeline tool asp_get_calib calls for the ASPECT CalDB files, including DARK_CURR.
THREADS AFFECTED:
None.