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A sample of 286 gamma-ray bursts (GRBs) detected by the Swift satellite and358 GRBs detected by the RHESSI satellite are studied statistically. Previouslypublished articles, based on the BATSE GRB Catalog, claimed the existence of anintermediate subgroup of GRBs with respect to duration. We use the statisticalchi^2 test and the F-test to compare the number of GRB subgroups in ourdatabases with the earlier BATSE results. Similarly to the BATSE database, theshort and long subgroups are well detected in the Swift and RHESSI data.However, contrary to the BATSE data, we have not found a statisticallysignificant intermediate subgroup in either Swift or RHESSI data.

A Search for Gamma-ray Burst Subgroups in the SWIFT and RHESSI Databases