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Peer-reviewed

Suzaku Wide-band All-sky Monitor measurements of duration distributions of gamma-ray bursts

Norisuke Ohmori, K. Yamaoka, M. Ohno, Satoshi Sugita, R. Kinoshita, Yusuke Nishioka, K. Hurley, Yoshitaka Hanabata, M. Tashiro, J. Enomoto, T. Fujinuma, Yasushi Fukazawa, W. Iwakiri, Takafumi Kawano, M. Kokubun, Kazuo Makishima, S. Matsuoka, T. Nagayoshi, Y. E. Nakagawa, S. Nakaya, Kazuhiro Nakazawa, Tadayuki Takahashi, S. Takeda, Y. Terada, Y. Urata, Seiya Yabe, T. Yasuda, M. Yamauchi

Publications of the Astronomical Society of Japan · 2016

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Summary

Abstract We report on the T90 and T50 duration distributions and their relations with spectral hardness using 1464 gamma-ray bursts (GRBs), which were observed by the Suzaku Wide-band All-sky Monitor (WAM) from 2005 August 4 to 2010 December 29. The duration distribution is clearly bimodal in three energy ranges (50–120, 120–250, and 250–550 keV), but is unclear in the 550–5000 keV range, probably because of the limited sample size. The WAM durations decrease with energy according to a power-law index of −0.058(−0.034, +0.033). The hardness–duration relation reveals the presence of short–hard and long–soft GRBs. The short:long event ratio tends to be higher with increasing energy. We compared the WAM distribution with ones measured by eight other GRB instruments. The WAM T90 distribution i

Source type
Peer-reviewed study
DOI
10.1093/pasj/psw009
Catalogue ID
BFmoakvhek-zcqqb4
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