[vsnet-grb-info 12682] GRB 121122A: Suzaku WAM observation of the prompt emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14042
SUBJECT: GRB 121122A: Suzaku WAM observation of the prompt emission
DATE:    12/12/03 01:23:19 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 long, IPN localized GRB 121122A (Hurley et al., GCN 14001)
was detected by the the Suzaku Wide-band All-sky Monitor (WAM) which
covers an energy range of 50 keV - 5 MeV at 21:14:53 UT (=T0).

The observed light curve shows double-peaked FRED-like structure
lasting from T0 to T0+7 s with a duration (T90) of about 7 seconds.
The fluence in 100 - 1000 keV was 1.98 (+0.11/-0.16) x 10^-5 erg/cm^2.
The 1-s peak flux measured from T0 was 12.7 (+10.1/-1.25) photons/cm^2/s
in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0 to
T0+7 s is well fitted by a single power-law with a photon index
of 3.08 (+0.17/-0.15) (chi2/d.o.f = 9.6/14).

The light curves with 1-sec time resolution for this burst will be
appeared at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html