BATSE Observations of the Hard X-Ray Transient GRS1915+105

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Session 102 -- X-Ray Variables, Binaries and Transients
Display presentation, Thursday, 12, 1995, 9:20am - 6:30pm

[102.08] BATSE Observations of the Hard X-Ray Transient GRS1915+105

K. J. Deal, W. S. Paciesas, M. S. Briggs, G. N. Pendleton (UAH), B. A. Harmon, C. A. Wilson, G. J. Fishman (NASA/MSFC), S. N. Zhang (USRA)

The Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma Ray Observatory has been monitoring the unusual X-ray transient source GRS1915+105 since its discovery by WATCH in August 1992 (Castro-Tirado et al., IAU Circ. 5590). The source was observed in BATSE data as early as May 1992 and was still visible as of October 1994. The source exhibits a hard power law spectrum (from -2.5 to -3.0) in the 20 - 200 keV range with erratic changes in intensity over days to weeks. While the nature of this source is still unknown, recent observations by the Nancay Radiotelescope and the Very Large Array during March/April 1994 showed a strong radio outburst followed by large proper motions of a pair of radio condensations emerging from this source (Mirabel et al.,1994). We examine here coincident BATSE observations to the March 1994 radio output for correlated behavior in the hard X-ray and radio bands.

Castrado-Tirado, A. J. et al., 1992, IAU Circular 5590

Mirabel, I. F. et al., 1994 Nature, 371, 46

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