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Takaya Ohashi, Ken Ebisawa, Yasushi Fukazawa, Kenji Hiyoshi, Michihiro Horii, Yasushi Ikebe, Hitoshi Ikeda, Hajime Inoue, Manabu Ishida, Yoshitaka Ishisaki, Toshio Ishizuka, Shunsuke Kamijo, Hidehiro Kaneda, Yoshiki Kohmura, Kazuo Makishima, Tatehiro Mihara, Makoto Tashiro, Toshio Murakami, Riichirou Shoumura, Yasuo Tanaka, Yoshihiro Ueda, Koji Taguchi, Takeshi Tsuru, Toshiaki Takeshima, The Gas Imaging Spectrometer on Board ASCA, Publications of the Astronomical Society of Japan, Volume 48, Issue 2, 1 April 1996, Pages 157–170, https://doi.org/10.1093/pasj/48.2.157
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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.