The Spin-X Wide-Field X-ray Monitor of the Spectrum-X-Gamma Astrophysical Observatory

Details The Spin-X Wide-Field X-ray Monitor of the Spectrum-X-Gamma Astrophysical Observatory The Spin-X Wide-Field X-ray Monitor of the Spectrum-X-Gamma Astrophysical Observatory

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000astl...26..779p&link_type=abstract

Astronomy Letters, vol. 26, p. 779-787 (2000)

Astronomy and Astrophysics

Astronomy

X-Ray Monitor, Gamma-Ray Bursts, Bursters, Galactic Center, Coded Aperture

Scientific paper

The Spin-X wide-field X-ray monitor of the Spectrum-X-Gamma astrophysical observatory, which is based on the principle of a coded-aperture telescope, is designed to detect and localize cosmic gamma-ray burst (GRB) sources; to survey large areas of the sky in search of new transients; and to carry out long-term observations of bright Galactic sources, including X-ray bursters. The monitor consists of two noncoaxial identical modules, Spin-X1 and Spin-X2, which together cover 6.8% of the sky. The high-apogee, four-day orbit of the Spectrum-XG satellite allows the instrument to be in observing mode more than 50% of the time. Having simulated the rate of GRB detection by Spin-X, we show that extrapolating BATSE 50-300-keV average data on the number of GRBs, their duration, and their mean energy spectrum to the X-ray energy band leads to disagreement with the observed detection rate of GRBs in the X-ray band. The number of GRBs that can be detected and localized with an accuracy r < 3 arcmin (the 3-sigma error-circle radius) by Spin-X is estimated to be ten bursts per year. We present data on the Spin-X sensitivity achievable during long-term observations of persistent and transient sources and on its sensitivity to X-ray bursts from Galactic sources in the 2-30-keV energy band.

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