TITLE:   GCN CIRCULAR
NUMBER:  14995
SUBJECT: GRB 130628A: Suzaku WAM observation of the prompt emission
DATE:    13/07/08 11:25:03 GMT
FROM:    Makoto Tashiro at Saitama U/Swift  <tashiro@phy.saitama-u.ac.jp>

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


The short GRB 130628A (Byrne et al. GCN 14969) was detected by the the
Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of
50 keV - 5 MeV at 12:44:04.634 UT (=T0). The observed light curve shows
a single peak with a duration (T90) of about 2.4 seconds. The fluence in
100 - 1000 keV was 3.70 (+0.65/-0.71) x 10^-6 erg/cm2. The 1-s peak flux
measured from T0+2 s was 2.93 (+0.54/-0.71) photons/cm2/s in the same
energy range.

Preliminary result shows that the time-averaged spectrum from T0-5 s to
T0+5 s is well fitted by a single power-law with a photon index of 2.11
(+0.41/-0.31) (chi2/d.o.f = 20.3/15).

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

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