Soft gamma-ray bursts in the batse data

Y. A. Tikhomirova, B. E. Stern, A. Kozyreva, J. Poutanen

Research output: Contribution to conferencePaperpeer-review

Abstract

We performed the scan of the BATSE DISCLA records inspecting 25-50 keV range to pick up soft GRBs. We applied the same technique as in our previous (Stern et al. 2001)1 scan in the 50-300 keV range. We scanned about 1.8 year of the data and found 30 new gamma-ray burst (GRB)s. The total number of soft GRBs in the BATSE data, with the count rate in the 25-50 keV range higher than in the 50-300 keV range, is only 4%. There are about two extremely soft events per year which are invisible about 50 keV and which could constitute a new class of events separate from the GRB phenomenon. We also show that X-ray flashes (XRFs) detected by BeppoSAX have a hardness ratio very similar to that of normal GRBs, supporting a view that XRFs and GRBs are a single phenomenon with a wide spectral variety.

Original languageEnglish
StatePublished - 2005
Externally publishedYes
Event40th Rencontres de Moriond on Very High Energy Phenomena in the Universe, VHEPU 2005 - La Thuile, Italy
Duration: 12 Mar 200519 Mar 2005

Conference

Conference40th Rencontres de Moriond on Very High Energy Phenomena in the Universe, VHEPU 2005
Country/TerritoryItaly
CityLa Thuile
Period12/03/0519/03/05

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