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

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Scientific paper

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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