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Soft Gamma-Ray Bursts in the BATSE data | | Ya.Tikhomirova
; B.Stern
; A.Kozyreva
; J.Poutanen
; | | Date: |
24 May 2005 | | Subject: | astro-ph | | Affiliation: | ASC LPI, Moscow), B.Stern (INR, ASC LPI, Moscow), A.Kozyreva (SAI, Moscow), and J.Poutanen (Univ.of Oulu, Finland | | 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) 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. | | Source: | arXiv, astro-ph/0505490 | | Services: | Forum | Review | PDF | Favorites | |
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