In-flight calibration of EGRET on the Compton Gamma-Ray Observatory

被引:69
作者
Esposito, JA
Bertsch, DL
Chen, AW
Dingus, BL
Fichtel, CE
Hartman, RC
Hunter, SD
Kanbach, G
Kniffen, DA
Lin, YC
Mayer-Hasselwander, HA
McDonald, LM
Michelson, PF
von Montigny, C
Mukherjee, R
Nolan, PL
Reimer, OL
Schneid, E
Sreekumar, P
Thompson, DJ
Tompkins, WF
Willis, TD
机构
[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[2] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA
[3] Max Planck Inst Extraterr Phys, D-85740 Garching, Germany
[4] Hampden Sydney Coll, Hampden Sydney, VA 23943 USA
[5] Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA
[6] Sci & Comp, D-72070 Tubingen, Germany
[7] Columbia Univ Barnard Coll, Dept Phys & Astron, New York, NY 10027 USA
[8] Northrup Grumman Corp, Bethpage, NY 11714 USA
关键词
gamma rays : observations; instrumentation : detectors; methods : observational;
D O I
10.1086/313227
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma-Ray Observatory has been operating for over 7 yr since its launch in 1991 April. This span of time far exceeds the design lifetime of 2 yr. As the instrument has aged, several changes have occurred owing to spark chamber gas exchanges as well as some hardware degradation and failures, all of which have an influence on the instrument sensitivity. This paper describes postlaunch measurements and analysis that are done to calibrate the instrument response functions. The updated instrument characteristics are incorporated into the analysis software.
引用
收藏
页码:203 / 217
页数:15
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