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Last modified: 26 October 2016

URL: http://cxc.harvard.edu/ciao/why/hrc_tgain.html

HRC-S Time-dependent Gain Corrections and PI Filter


A new HRC-S gain map and a pulse-height filter for use with LETG data was released in CALDB 4.2.0 (15 December 2009). Over half of Level=2 background events can be removed at most wavelengths with a loss of ~1.25% of X-ray events.

The primary differences from the old gain map and PI filter are:

Relevant Plots

Users working with HRC-S data should reprocess to improve the TGAIN calibration in their data by running the chandra_repro script or by following the Create a New Level=2 Event File thread. The PI background filter is applied to HRC-S/LETG data, as explained in the "Apply background filter" section of the LETG/HRC-S Grating Spectra thread.


Last modified: 26 October 2016
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