Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-07
Mon.Not.Roy.Astron.Soc.367:1473-1477,2006
Astronomy and Astrophysics
Astrophysics
Submitted to MNRAS, 5 pages, 3 figures, 2 tables
Scientific paper
10.1111/j.1365-2966.2006.10047.x
A population of X-ray dominated gamma-ray bursts (GRBs) observed by Ginga, BeppoSax and Hete-2 should be represented in the BATSE data as presumably soft bursts. We have performed a search for soft GRBs in the BATSE records in the 25--100 keV energy band. A softness of a burst spectrum can be a reason why it has been missed by the on-board procedure and previous searches for untriggered GRBs tuned to 50--300 keV range. We have found a surprisingly small number (~20/yr down to 0.1 ph cm$^{-2}$ s$^{-1}$) of soft GRBs where the count rate is dominated by 25--50 keV energy channel. This fact as well as the analysis of HETE-2 and common BeppoSAX/BATSE GRBs indicates that the majority of GRBs with a low Epeak has a relatively hard tail with the high-energy power-law photon index >-3. An exponential cutoff in GRB spectra below 20 keV may be a distinguishing feature separating non-GRB events.
Kozyreva Alexandra
Poutanen Juri
Stern Boris
Tikhomirova Yana
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