The Gas Imaging Spectrometer on Board ASCA
Open Access
- 1 April 1996
- journal article
- research article
- Published by Oxford University Press (OUP) in Publications of the Astronomical Society of Japan
- Vol. 48 (2) , 157-170
- https://doi.org/10.1093/pasj/48.2.157
Abstract
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.Keywords
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