LOCATION AND SPECTRUM OF THE X-RAY TRANSIENT SOURCE GRS 1915+105

A 20-hour observation of the recently discovered x-ray transient sourc e GRS 1915 + 105 in Aquila was made on September 23-24, 1992, with the SIGMA telescope of the Granat observatory. The flux from the source i n the range from 35 keV to 70 keV was 150 +/- 20 mCrab. From the resul ts of the observation, the transient source was located at alpha1950 = 19h12m51s, delta1950 = 10-degrees 51.4' with 3.0 accuracy (confidence level 90%). The source spectrum in the 35 keV to 250 keV range can be approximated by a power law with a photon spectral index -2.5 +/- 0.3 . The data from the SIGMA telescope did not indicate any relationship between the transient source GRS 1915+105 in Aquila and repeated gamma ray bursts from this region recorded by the BATSE instrument from Jun e to August 1992. The more accurate location by comparison with the WA TCH instrument data of the object GRS 1915 + 105 that is published in our paper showed that it is located 1.7-degrees from the nearest point in the source B1900 + 14, which is the most probable source of these bursts. No gamma ray bursts were detected over the time of the observa tions of Aquila by the SIGMA telescope. The sensitivity of the SIGMA t elescope's burst cell is 2/3 the intensity of the weakest burst observ ed from this region by the BATSE instrument.