Localization and spectrum of the X-ray transient source GRS 1915 + 105

Details Localization and spectrum of the X-ray transient source GRS 1915 + 105 Localization and spectrum of the X-ray transient source GRS 1915 + 105

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..940f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 2, p. 940-942

Astronomy and Astrophysics

Astronomy

28

Flux (Rate), Gamma Ray Astronomy, Gamma Ray Bursts, Position (Location), X Ray Astronomy, X Ray Imagery, X Ray Spectra, X Ray Stars, Black Holes (Astronomy), Error Analysis, Nebulae, Novae, Soviet Spacecraft, Venera Satellites, X Ray Telescopes

Scientific paper

The observation of the recently discovered X-ray transient source GRS 1915 + 105, carried out by the SIGMA telescope on board GRAN AT, has significantly improved the accuracy of determination of the source position. The analysis of the 40-70 keV image provides localization of the source at alpha = 19 hr 12 min 51 s, delta = 10 deg 51.4 min (1950 equinox) with an error circle with radius of 3.0 min (90% confidence). In this observation on 1992 September 23-24, the source flux was detected at the level of 150 +/- 20 mCrab in the 35-70 keV energy range. The spectrum of GRS 1915 + 105, measured by SIGMA in the 35-250 keV energy domain, can be approximated by a power law with a photon index of -2.5 +/- 0.3. No evidence for association of GRS 1915 + 105 with the Soft Gamma Repeater (SGR) B 1900 + 14 has been found in the SIGMA data. The position of GRS 1915 + 105 is approximately 1.7 deg apart from the nearest point of SGRs 2 sigma error box, obtained by the VENERA/KONUS experiment (E. Mazets, private communication). No soft gamma-ray bursts were also detected by SIGMA during 20 hours of observations of the Aquila field. The sensitivity of the GRB-cell to the SGR-type bursts is approximately 1/10 of the brightness of the weakest burst, observed by the KONUS experiment in 1979, and approximately 2/3 of the weakest burst, detected by Burst and Transient Source Experiment (BATSE) in 1992.

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