SIGMA observations of the soft gamma-ray source GRS 1758-258

Details SIGMA observations of the soft gamma-ray source GRS 1758-258 SIGMA observations of the soft gamma-ray source GRS 1758-258

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..751l&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)751-(12)754

Astronomy and Astrophysics

Astronomy

1

Black Holes (Astronomy), Curve Fitting, Flux Density, Gamma Ray Astronomy, Gamma Ray Spectra, Imagery, Light Curve, Milky Way Galaxy, Exosat Satellite, Gamma Ray Telescopes, Heao 1, Rosat Mission, Satellite-Borne Instruments, Sky Surveys (Astronomy), Soviet Spacecraft, Spacelab Payloads

Scientific paper

The field containing the newly discovered soft gamma-ray source GRS 1758-258, located 40 arcmin. away from GX 5-1, was observed by the SIGMA telescope on board the soviet spacecraft GRANAT in the course ofthe five extensive galactic-center surveys performed in 1990, 1991 and 1992. In both 1990 surveys, as well as in the February-April 1991 survey, the source exhibits a Cygnus X-1 like spectrum with nearly constant flux, while in the most recent measurements on September-October 1991 and spring 1992, a long-term low-state has been discovered with an upper limit on the source flux of five times lower than the average flux measured by SIGMA during all the observations from March 1990 until April 1991.

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