New Soft BATSE GRBs and Spectra of X-Ray Rich Bursts

Details New Soft BATSE GRBs and Spectra of X-Ray Rich Bursts New Soft BATSE GRBs and Spectra of X-Ray Rich Bursts

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe..60t&link_type=abstract

Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 10, 2006, Kavli Institute for Theoretical Physics,

Physics

Scientific paper

A population of X-ray dominated gamma-ray bursts (GRBs) observed byGinga, BeppoSax and HETE-2 experiments should be represented in the BATSEdata as presumably soft bursts. We have performed a search for soft GRBsin 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 bythe on-board procedure and previous searches for untriggered GRBs tuned to50-300 keV range. We have found a surprisingly small number ( 20yr^{-1} down to 0.1 ph cm^{-2} s^{-1}) of soft GRBs where the count rate isdominated by 25-50 keV energy channel. This fact as well as the analysisof HETE-2 and common BeppoSAX/BATSE GRBs indicates that the majority ofGRBs with a low Epeak has a relatively hard tail with the high-energypower-law photon index beta>-3. An exponential cutoff in GRB spectra below20 keV may be a distinguishing feature separating non-GRB events.

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