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

Gamma-Ray Burst Classes Found in the RHESSI Data Sample