A 3rd Class of Gamma Ray Bursts?

Abstract

Two classes of Gamma Ray Bursts have been identified so far, characterized by T_90 durations shorter and longer than approximately 2 seconds. We show here that the BATSE 3B data allow a good fit with three Gaussian distributions in log T_90. The chi^2 statistic indicates a 40 % probability for two Gaussians, whereas the three-Gaussian fit probability is 98 %. Using another statistical method, it is argued that the probability that the third class is a random fluctuation is less than 0.02 %.

10 pages, 5 Postscript figures. Submitted to The Astrophysical Journal, October 1997

References in corpus (3)

• Three types of gamma-ray bursts
• Cosmological Brightness Distribution Fits of Gamma Ray Burst Sources
• BATSE Gamma-Ray Burst Line Search: V. Probability of Detecting a Line in a Burst

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