Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60s.361o&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.60, No.SP1, pp.S361--S374
Astronomy and Astrophysics
Astronomy
3
Gamma Rays: Burst, Gamma Rays: Observations
Scientific paper
We have performed a joint analysis of prompt emission from four bright short gamma-ray bursts (GRBs) with the Suzaku-WAM and the Konus-Wind experiments. This joint analysis allows us to investigate the spectral properties of short-duration bursts over a wider energy band with a higher accuracy. We find that these bursts have a high Epeak, around 1MeV and have a harder power-law component than that of long GRBs. However, we can not determine whether these spectra follow the cut-off power-law model or the Band model. We also investigated the spectral lag, hardness ratio, inferred isotropic radiation energy and existence of a soft emission hump, in order to classify them into short or long GRBs using several criteria, in addition to the burst duration. We find that all criteria, except for the existence of the soft hump, support the fact that our four GRBsamples are correctly classified as belonging to the short class. In addition, our broad-band analysis revealed that there is no evidence of GRBs with a very large hardness ratio, as seen in the BATSE short GRBsample, and that the spectral lag of our four short GRBs is consistent with zero, even in theMeV energy band, unlike long GRBs. Although our short GRBsamples are still limited, these results suggest that the spectral hardness of short GRBs might not differ significantly from that of long GRBs, and also that the spectral lag at high energies could be a strong criterion for burst classification.
Frederiks Dmitry
Fukazawa Yasushi
Hurley Kevin
Ohno Masanori
Oleynik Philipp
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