Chandra Calibration Status. Summary The gratings and mirrors are very well calibrated at this time and there are no time-dependent effects as far as we can tell.
The gratings and mirrors are very well calibrated at this time and there are no time-dependent effects as far as we can tell.
Most activities in the calibration group are centered on improving the calibration of the detectors and monitoring the time-dependence response of the detectors.
At present we have a single time-independent QE for each ACIS chip and HRC MCP, however, the transmission of the contaminate on ACIS is time-dependent.
The spectral response of both ACIS detectors and both HRC detectors is also treated in a time-independent manner.
The ACIS gains are calibrated every 3 months and the HRC gains are calibrated once per year.
There are two sets of trap maps for each ACIS FI chip (one set for the first 4 years and one set for the second 4 years) and only one set of trap maps for the ACIS BI chips.
Gain correction files for epochs 25 and 26 (Nov 2005-May 2006) were released in CALDB 3.2.4 on Nov. 7, 2006.
A set of cti-corrected (serial and parallel) calibration products for the BI chips at T=-120 C was released in CALDB 3.3 on Dec. 18, 2006. These products include: trap maps, QE maps, response files, and OSIP files.
A revised version of the ACIS QE with corrections near the SI-K edge was released in CALDB 3.3
Gain correction files for epoch 27 (May 2006-Nov 2006) were released in CALDB 3.3