[vsnet-grb-info 6118] GRB 080514B: Suzaku WAM observation of the prompt emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7752
SUBJECT: GRB 080514B: Suzaku WAM observation of the prompt emission
DATE:    08/05/20 06:20:41 GMT
FROM:    Yoshitaka Hanabata at Hiroshima U  <hanabata at hep01.hepl.hiroshima-u.ac.jp>

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

The long GRB 080514B, (SuperAGILE/IPN: Rapisarda et al., GCN7715 )
triggered the Suzaku Wide-band  All-sky Monitor (WAM) 
which covers an energy range of 50 keV - 5 MeV at 09:55:57 UT (=T0). 
The observed light curve shows a multi-peaked structure 
starting at T0-1s , ending at T0+7s, with a duration (T90) of about
6.3 seconds. The fluence in 100 - 1000 keV was 1.4(+0.2,-0.1) x 10^-5
erg/cm^2. The 1-s peak flux measured from T0+2s was 11.3(+0.5,-0.1)
photons/cm^2/s in the same energy range.

A preliminary result shows that the time-averaged spectrum from 
T0-1s to T0+7s is well fitted by a GRB Band model as follows.
the low-energy photon index alpha: -1.4(+0.6,-0.5),
the upper limit of the high-energy photon index beta: -2.5
and the peak energy Epeak: 259 (+43, -104) keV (chi^2/d.o.f = 27.9/23).
----

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

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The light curves for this burst are available at:

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