The Gas Imaging Spectrometer on Board ASCA

The Gas Imaging Spectrometer on Board ASCA

The Gas Imaging Spectrometer (GIS) system on board ASCA is described. The experiment consists of 2 units of imaging gas scintillation proportional counters with a sealed-off gas cell equipped with an imaging phototube. The performance is characterized by the high X-ray sensitivity (from 0.7 keV to o...

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Bibliographic Details
Published in:Publications of the Astronomical Society of Japan Vol. 48; no. 2; pp. 157 - 170
Main Authors: Ohashi, Takaya, Ebisawa, Ken, Fukazawa, Yasushi, Hiyoshi, Kenji, Horii, Michihiro, Ikebe, Yasushi, Ikeda, Hitoshi, Inoue, Hajime, Ishida, Manabu, Ishisaki, Yoshitaka, Ishizuka, Toshio, Kamijo, Shunsuke, Kaneda, Hidehiro, Kohmura, Yoshiki, Makishima, Kazuo, Mihara, Tatehiro, Tashiro, Makoto, Murakami, Toshio, Shoumura, Riichirou, Tanaka, Yasuo, Ueda, Yoshihiro, Taguchi, Koji, Tsuru, Takeshi, Takeshima, Toshiaki
Format: Journal Article
Language:English
Published: 01-04-1996
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Summary:The Gas Imaging Spectrometer (GIS) system on board ASCA is described. The experiment consists of 2 units of imaging gas scintillation proportional counters with a sealed-off gas cell equipped with an imaging phototube. The performance is characterized by the high X-ray sensitivity (from 0.7 keV to over 10 keV), good energy resolution (7.8% FWHM at 6 keV following E−0.5 as a function of X-ray energy E), moderate position resolution (0.5 mm FWHM at 6 keV with E−0.5 dependence), fast time resolution down to 61 μs, and an effective area of 50 mm diameter. The on-board signal processing system and the data transmitted to the ground are also described. The background rejection efficiency of the GIS is reaching the level achieved by the non-imaging multi-cell proportional counters.
ISSN:0004-6264
2053-051X
DOI:10.1093/pasj/48.2.157