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Localization and spectrum of the X-ray transient source GRS 1915 + 105
Finoguenov, A.; Churazov, E.; Gilfanov, M.; Sunyaev, R.; Vikhlinin, A.; Dyachkov, A.; Khavenson, N.; Tserenin, I.; Schmitz-Fraysse, M. C.; Denis, M.; Roques, J. P.; Mandrou, P.; Claret, A.; Ballet, J.; Cordier, B.; Goldwurm, A.
AA(Russian Academy of Sciences, Moscow, Russia), AB(Russian Academy of Sciences, Moscow, Russia), AC(Russian Academy of Sciences, Moscow, Russia), AD(Russian Academy of Sciences, Moscow, Russia), AE(Russian Academy of Sciences, Moscow, Russia), AF(Russian Academy of Sciences, Moscow, Russia), AG(Russian Academy of Sciences, Moscow, Russia), AH(Russian Academy of Sciences, Moscow, Russia), AI(Centre d'Étude Spatiale des Rayonnements, France), AJ(Centre d'Étude Spatiale des Rayonnements, France)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 2, p. 940-942 (ApJ Homepage)
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NASA/STI Keywords:
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
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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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