SIGMA discovery of a transient hard X-ray source in the galactic center region.

Details SIGMA discovery of a transient hard X-ray source in the galactic center region. SIGMA discovery of a transient hard X-ray source in the galactic center region.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..828v&link_type=abstract

Astronomy and Astrophysics, v.313, p.828-832

Astronomy and Astrophysics

Astrophysics

12

Stars: Individual: Grs 1730-312, X-Ray: Stars, Binaries: Close, Gamma Rays: Observations

Scientific paper

A new X-ray transient source, GRS 1730-312 (=KS 1730-312), was discovered by the hard X-ray/soft γ-ray coded mask telescope SIGMA/GRANAT in the Galactic Center region during observations performed in September 1994. The flare started on September 22 and lasted approximately 3days, during which the source became the brightest object of the region at energies above 35keV. The average 35-200keV spectrum can be described by a power law with photon index of -2.5 or by a thermal bremsstrahlung model with kT_e_=~70keV. SIGMA data have been found consistent with the spectral shape and with the spectral evolution observed by the TTM/Mir-Kvant telescope at lower energies. This new source belongs to the population of hard X-ray sources already detected by SIGMA in the direction of the Galactic Bulge region.

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