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Session 14 - Gamma-Ray Bursts.
Display session, Monday, June 10
Great Hall,
We report preliminary results on the behavior of gamma-ray bursts (GRBs) in the 7-14 keV bandpass from a study using the BATSE Spectroscopy Detectors (SD) aboard the Compton Gamma-Ray Observatory. Concentrating on the BATSE 1B catalogue, we find 72 GRBs that had detectable 7-14 keV fluxes. This detection rate suggests that 15% of all bursts detected by the BATSE Large Area Detectors (LADs) will have measurable fluxes in the BATSE SD data base. We have examined the properties (hardness ratios, peak fluxes, and durations) of the 72 detected bursts, and find no particular characteristics that would exclude a burst from being detected by an SD. The detection of many bursts with very low (LAD) peak fluxes suggests that some bursts emit a considerable fraction of their luminosity at soft x-ray energies. We find that small time delays between peaks in the light curves at LAD (75 - 100 keV) and SD (7-14 keV) energies are common. We present a gallery of 7-14 keV light curves for the most interesting bursts from the BATSE 1B catalogue.
