Presentation details
» The gamma-ray burst classes found in the RHESSI data sample
Presentation duration: 20 minutes
Presenter: Jakub Řípa
A sample of 427 gamma-ray bursts (GRBs), measured by the RHESSI satellite, is studied statistically in order to determine the number of GRB groups. Previous studies based on the BATSE Catalog and recently on Swift data claim the existence of an intermediate GRB group, besides the long and short groups. Using only the GRB duration T90 as information and χ2 or F-test, we have not found any statistically significant intermediate group in the RHESSI data. However, maximum likelihood ratio test reveals a significant intermediate group. Also using the 2-dimensional hardness vs. T90 plane, the maximum likelihood analysis reveals a significant intermediate group. And so, the existence of an intermediate group follows not only from the BATSE and Swift data-set, but also from the RHESSI one.