A Comparison of Gamma-ray Burst Subgroups Measured by RHESSI and BATSE

Authors :: Ripa, J.
Huja, D.
Hudec, R.
Hajdas, W.
Wigger, C.
Source :: AIP Conf.Proc.1085:674-676,2008
Publication Year :: 2009
Abstract: A sample of almost 400 Gamma-ray bursts (GRBs) detected by the RHESSI satellite is studied statistically. We focus on GRB duration and hardness ratio and use the statistical chi^2 test and the F-test to compare the number of GRB subgroups in the RHESSI database with that of the BATSE database. Although some previous articles based on the BATSE catalog claim the existence of an intermediate GRB subgroup, besides long and short, we have not found a statistically significant intermediate subgroup in the RHESSI data.<br />Comment: Published in Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy