Analysis of the Swift Gamma-Ray Bursts duration

Details Analysis of the Swift Gamma-Ray Bursts duration Analysis of the Swift Gamma-Ray Bursts duration

2009-06-30

arxiv.org/abs/0906.5582v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

NANJING GAMMA-RAY BURST CONFERENCE 2008

Scientific paper

10.1063/1.3027961

Two classes of gamma-ray bursts have been identified in the BATSE catalogs characterized by durations shorter and longer than about 2 seconds. There are, however, some indications for the existence of a third type of burst. Swift satellite detectors have different spectral sensitivity than pre-Swift ones for gamma-ray bursts. Therefore it is worth to reanalyze the durations and their distribution and also the classification of GRBs. Using The First BAT Catalog the maximum likelihood estimation was used to analyzed the duration distribution of GRBs. The three log-normal fit is significantly (99.54 % probability) better than the two for the duration distribution. Monte-Carlo simulations also confirm this probability (99.2 %).

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