A high-sensitivity search for gamma-ray bursts by the SIGMA telescope on board GRANAT (the Galactic center and all sky data)

Details A high-sensitivity search for gamma-ray bursts by the SIGMA telescope on board GRANAT (the Galactic center and all sky data) A high-sensitivity search for gamma-ray bursts by the SIGMA telescope on board GRANAT (the Galactic center and all sky data)

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402..579s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 2, p. 579-584.

Astronomy and Astrophysics

Astronomy

7

Gamma Ray Bursts, Sky Surveys (Astronomy), Spaceborne Astronomy, Galactic Bulge, Galactic Clusters, Luminosity, Telescopes

Scientific paper

Results of a two-year search for weak gamma-ray burst (GRB) events (about 10 exp -7 ergs/sq cm) with the SIGMA telescope on board the GRANAT mission are presented. No GRB events were detected within the coded field of view of the telescope during observations of the Galactic center as well as during observations of other regions on the celestial sphere. The Galactic center was not found to be the source of frequent weak GRBs with intrinsic luminosity approximately the Eddington limit for a neutron star. This result restricts the rate of bursts with luminosity above the threshold value originating from the Galactic Bulge to less than about 6 x 10 exp -9 bursts/yr solar mass. The number of weak GRB events near the SIGMA sensitivity threshold is sufficiently lower than expected from extrapolation of KONUS results.

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