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Proceedings Paper

HRC-I gain correction
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Paper Abstract

We study the gain variations in the HRC-I over the duration of the Chandra mission. We analyze calibration observations of AR Lac obtained yearly at the nominal aimpoint and at 20 offset locations on the detector. We show that the gain is declining, and that the time dependence of the gain can be modeled generally as a linear decrease in PHAs. We describe the spatial and temporal characteristics of the gain decline and discuss the creation of time-dependent gain correction maps. These maps are used to convert PHAs to PI channels, thereby removing spatial and temporal dependence, and allowing source pulse-height distributions to be compared directly regardless of observation date or location on the detector.

Paper Details

Date Published: 19 September 2007
PDF: 10 pages
Proc. SPIE 6686, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV, 66860V (19 September 2007); doi: 10.1117/12.740147
Show Author Affiliations
Jennifer Posson-Brown, Harvard-Smithsonian CfA (United States)
Vinay Kashyap, Harvard-Smithsonian CfA (United States)

Published in SPIE Proceedings Vol. 6686:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV
Oswald H.W. Siegmund, Editor(s)

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