[vsnet-grb-info 4796] GRB 070612A: Suzaku/WAM observation of the prompt emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6533
SUBJECT: GRB 070612A: Suzaku/WAM observation of the prompt emission
DATE:    07/06/14 03:01:27 GMT
FROM:    Takeshi Uehara at Hiroshima U  <uehara at hirax7.hepl.hiroshima-u.ac.jp>

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

The long burst, GRB 070612A (Swift/BAT trigger #282066; D. Grupe et al.,
GCN Circ. 6509 ), was triggered at 02:38:41 UT (=T0) by the Suzaku Wide-band
All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV.
The observed light curve shows a single peaked structure with a duration (T90)
of nearly 35 seconds. The fluence in 100-1000 keV was (8.2 +/- 2.4) * 10^-6 erg/cm^2.
The 1-s peak flux was 1.2 (+0.4, -0.3) photons/cm^2/s in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0-4 to
T0+36 sec is well fitted by a single power law model with a photon index
of 2.5 +/ -0.3 (chi^2/d.o.f. = 31/21).

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

The WAM light curve of this event is available at the following web cite.

http://www.astro.isas.ac.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html