[vsnet-grb-info 9986] GRB 101129A : Suzaku WAM observation of the prompt emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11443
SUBJECT: GRB 101129A : Suzaku WAM observation of the prompt emission
DATE:    10/12/07 01:13:09 GMT
FROM:    Norisuke Ohmori at Miyazaki U  <ohmori at astro.miyazaki-u.ac.jp>

N. Ohmori, A. Daikyuji, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki),
M. Ohno, M. Kokubun, T. Takahashi (ISAS/JAXA), K. Yamaoka (Aoyama Gakuin U.), 
S. Sugita (Nagoya U.), Y. Terada, M. Tashiro, W. Iwakiri, K. Takahara, 
T. Yasuda (Saitama U.),P. Tsai, Y. Urata, H.M. Lin (NCU), 
T. Uehara, Y. Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.), 
N. Vasquez (Tokyo Tech.), Y. E. Nakagawa, M. Serino, T. Tamagawa (RIKEN), 
K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.), 
on behalf of the Suzaku WAM team, report:


The short GRB 101129A (localized by Swift/BAT and IPN; Cummings et al., 
GCN11436) triggered the Suzaku Wide-band  All-sky Monitor (WAM) which 
covers an energy range of 50 keV - 5 MeV at 2010-11-29 15:39:31.92 UT (=T0).

The observed light curve shows a multi-peaked structure starting at T0+0.2s,
ending at T0+0.6s, with a duration (T90) of about 0.31 seconds. The fluence
in 100 - 1000 keV was 1.54 (-0.47, +0.12) x 10^-6 erg/cm^2.
The 1-s peak flux measured from T0s was 2.50 (-0.89, +0.30) photons/cm^2/s
in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0 to
T0+1s is well fitted by a power-law with exponential cutoff model:
dN/dE =  E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
alpha       0.43 (-0.62, +0.46), and
Epeak       1027 (-215, +292)  keV (chi^2/d.o.f. = 40.2/54).

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