8th HEAD Meeting, 8-11 September, 2004
Session 15 Black Holes Binaries and Intermediate Mass Black Holes
Poster, Thursday, September 9, 2004, 9:00am-10:00pm

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[15.10] Spectral Evolution of Gamma-Ray Outbursts from Galactic Black Hole Candidates

G. L. Case, M. L. Cherry, C. A. Fannin, J. C. Marsh, J. C. Rodi, L. T. Smith, C. E. Welch (Louisiana State University), J. C. Ling (JPL/Caltech), W. A. Wheaton (IPAC/Caltech)

The BATSE instrument aboard the Compton Gamma-Ray Observatory viewed GRS 1009-45, 4U1543-45 and XTE 1550-564, almost continuously from 1991 to 2000. These objects are black hole candidates (BHCs), and were observed to undergo gamma-ray outbursts. We present results from the full nine-year BATSE earth-occultation database using the JPL data analysis package EBOP (Enhanced BATSE Occultation Package). Light curves with 1-day resolution are presented showing flux histories during the time periods when the objects were flaring. Also presented is the time evolution of the 35-1000 keV spectra from the rising, peak, and falling portions of the flares. Comparisons are then made to other BHCs in our galaxy.

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Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.