[vsnet-grb-info 4914] GRB 070714B : Suzaku WAM observation of the prompt emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6637
SUBJECT: GRB 070714B : Suzaku WAM observation of the prompt emission
DATE:    07/07/19 13:37:25 GMT
FROM:    Makoto Tashiro at Saitama U/Swift  <tashiro at phy.saitama-u.ac.jp>

N. Kodaka, M. Tashiro, Y. Urata, A. Endo, K. Onda, M. Suzuki,
K. Morigami (Saitama U.),Y. Terada, T. Tamagawa (RIKEN), M. Ohno,
T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira (Hiroshima U.),
K. Yamaoka, Y. E. Nakagawa, S. Sugita (Aoyama Gakuin U.), T. Enoto,
R. Miyawaki, K. Nakawaza, K. Makishima (Univ. of Tokyo), E. Sonoda,
M.Yamauchi, S. Maeno, H. Tanaka, R. Hara (Univ. of Miyazaki),
M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), S. Hong (Nihon U.),
on behalf of the Suzaku WAM team, report:

The short GRB 070714B (Swift/BAT trigger #284856; Racusin et al.,
GCN 6620; Barbier et al., GCN 6623) triggered the Suzaku Wide-band 
All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV
at 04:59:29.247 UT (=T0).
The observed light curve with 1/64 sec resolution shows a multi-peaked
structure with a sharp strong peak at ~T0+0.45 sec. The duration (T90) 
was about 2.0 sec.
The fluence in 100 - 1000 keV was (2.3 ± 0.2)x10^-6 erg/cm^2, while the
1-s peak flux measured from T0+0 to T0+1 sec was
2.8 ± 0.3 photons/cm^2/s in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0+0 to
T0+2 sec is well fitted by a single power-law with a photon index
of 1.3 ± 0.2 (chi^2 / d.o.f. = 22/20).

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

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