[vsnet-grb-info 12906] GRB 130216B: Suzaku WAM observation of the prompt emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14249
SUBJECT: GRB 130216B: Suzaku WAM observation of the prompt emission
DATE:    13/02/22 05:17:37 GMT
FROM:    Makoto Tashiro at Saitama U/Swift  <tashiro at phy.saitama-u.ac.jp>

T. Yasuda, M. Tashiro, Y. Terada, W. Iwakiri, K. Takahara, M. Asahina,
S. Kobayashi, A. Sakamoto, Y. Ishida, H. Ueno, S. Sugimoto (Saitama U.),
M. Akiyama, N. Ohmori, E. Mochinaga, M. Yamauchi (Univ. of Miyazaki),
K. Yamaoka, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. Hanabata,
T. Kawano, K. Takaki, R. Nakamura, Y.Tanaka, M. Ohno, Y. Fukazawa
(Hiroshima U.), S. Sugita (Nagoya U.), Y. E. Nakagawa (Waseda U.),
Y. Urata, P. Tsai (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo),
on behalf of the Suzaku WAM team, report:

The GRB 130216B  (Cummings 2013, GCN 14226) was triggered the Suzaku
Wide-band  All-sky Monitor (WAM) which covers an energy range of
50 keV - 5 MeV at 2013/02/16 18:58:13.41 UT (=T0).

The observed light curve shows a double-peaked structure starting at
T0-3.0 s and ending at T0+4.5 s with a duration (T90) of about
7.44 seconds. The fluence in 100 - 1000 keV was
1.81 (+0.21/-0.35) x 10^-6 erg/cm^2. The 1-s peak flux measured from
T0 was 2.62 (+0.46/-0.62) photons/cm^2/s in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0-1.0 s
to T0+6.5 s is well fitted by a single power-law with a photon index
of 2.93 (+0.68/-0.35) (chi^2/d.o.f = 12.5/14).

The light curves for this burst will be available at:
 
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html