[vsnet-grb-info 14628] GRB 140304A: Suzaku WAM observation of the prompt emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15942
SUBJECT: GRB 140304A: Suzaku WAM observation of the prompt emission
DATE:    14/03/10 07:14:31 GMT
FROM:    Kazutaka Yamaoka at Nagoya U  <yamaoka at stelab.nagoya-u.ac.jp>

W. Iwakiri (RIKEN), M. Tashiro, Y. Terada, T. Yasuda, Y. Ishida, H. Ueno,
S. Sugimoto, S. Koyama, S. Takeda, T. Nagayoshi (Saitama U.),
M. Yamauchi, N. Ohmori, M. Akiyama, R. Kinoshita (Univ. of Miyazaki),
M. Ohno, K. Takaki, T. Kawano, R. Nakamura, S. Furui, Y. Fukazawa
(Hiroshima U.), K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.), 
Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. Hanabata (ICRR),
Y. Urata (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo)
on behalf of the Suzaku WAM team, report:

The long GRB 140304A (Swift/BAT trigger #590206 ; Evans et al., GCN
15915; Fermi-GBM detection: Jenke and Fitzpatrick, GCN 15923) was
detected by the the Suzaku Wide-band All-sky Monitor (WAM) which covers
an energy range of 50 keV - 5 MeV at 13:22:33 UT (=T0).

The observed light curve shows a multi-peaked structure lasting from
T0-3 s to T0+11 s with a duration (T90) of about 12 seconds. The fluence
in 100 - 1000 keV was 1.69 (+0.32/-0.34) x10^-6 erg/cm^2.
The 1-s peak flux measured from T0-1 s was 0.48 (+0.28, -0.23)
photons/cm^2/s in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0-3 s to
T0+11 s is well fitted by a single power-law with a photon index of 2.09
(+0.66/-0.38) (chi^2/d.o.f = 12.3/14).

All the quoted errors are at statistical 90% confidence level, in which
the systematic uncertainties are not included.

The light curves with 1-sec time resolution for this burst are available at:

http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html
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FAX: 052-789-4313
E-mail: yamaoka at stelab.nagoya-u.ac.jp

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