Description of a subset of single events from the BATSE gamma ray burst data

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Gamma Ray Bursts, Gamma Ray Observatory, Light Curve, Criteria, Estimates, Oscillations, Shapes

Scientific paper

About 15 percent of the gamma ray bursts in the Burst and Transient Source Experiment (BATSE) data exhibit a simple light curve consisting mainly of a single pulse without fine substructures. In 12 of the burst profiles, the pulse shapes show a linear rise and decay. Three events have a distinct sharp rise followed by a long, almost exponential decay. Searches based on only a sharp rise selection criterion resulted in five more grbs with different profile complexities. In one case, we identify an envelope of fast oscillations with a long, softer tail lasting about 100 seconds. The majority of events were detectable at energies above 300 keV, with tentative estimates for fluences that vary between 4.0 x 10-8 and 5.4 x 10-6 ergs/sq cm. We describe here their general characteristics (durations, rise-decay times) and their hardness ratios.

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