Gamma-Ray Burst Classes Found in the RHESSI Data Sample

Details Gamma-Ray Burst Classes Found in the RHESSI Data Sample Gamma-Ray Burst Classes Found in the RHESSI Data Sample

2010-04-20

arxiv.org/abs/1004.3389v1

Baltic Astronomy, 18 (2009), 305-310

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 2 figures. Published in Proceedings of the 6th INTEGRAL/BART Workshop, 26-29 March, 2009.

Scientific paper

A sample of 427 gamma-ray bursts (GRBs), measured by the RHESSI satellite, is studied statistically to determine the number of GRB groups. Previous studies based on the BATSE Catalog and recently on the Swift data claim the existence of an intermediate GRB group, besides the long and short groups. Using only the GRB durations T90 and chi^2 or F-test, we have not found any statistically significant intermediate group. However, the maximum likelihood ratio test, one-dimensional as well as two-dimensional hardness vs. T90 plane, reveal the reality of an intermediate group. Hence, the existence of this group follows not only from the BATSE and Swift datasets, but also from the RHESSI results.

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