The Gas Imaging Spectrometer on Board ASCA

Details The Gas Imaging Spectrometer on Board ASCA The Gas Imaging Spectrometer on Board ASCA

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..157o&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.157-170.

Astronomy and Astrophysics

Astronomy

278

Instruments, Spacecraft, Spectroscopy, X-Rays: General, X-Rays: Spectra

Scientific paper

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 mu s, 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-c ell proportional counters.

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