GCN Circular 8050
Subject
GRB 080727C: Suzaku WAM observation of the prompt emission
Date
2008-08-01T11:12:42Z (17 years ago)
From
Kazutaka Yamaoka at Aoyama Gakuin U <yamaoka@phys.aoyama.ac.jp>
K. Yamaoka, S. Sugita (Aoyama Gakuin U.), M. Ohno, M. Kokubun,
M. Suzuki, T. Takahashi (ISAS/JAXA), Y.E. Nakagawa, T. Tamagawa
(RIKEN), T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata
(Hiroshima U.), M. Tashiro, Y. Terada, Y. Urata, A. Endo, K. Onda,
N. Kodaka, K. Morigami, T. Sugasahara, W. Iwakiri (Saitama U.),
T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), E. Sonoda, M. Yamauchi,
H. Tanaka, R. Hara, N. Ohmori (Univ. of Miyazaki), S. Hong (Nihon U.),
on behalf of the Suzaku WAM team, report:
The long 080727C (Swift/BAT trigger #318170; Parsons et al., GCN 8035)
triggered the Suzaku Wide-band All-sky Monitor (WAM) which
covers an energy range of 50 keV - 5 MeV at 23:07:51.558 UT (=T0).
The observed light curve shows two peaks, starting at T0-13s, ending
at T0+70s, with a duration (T90) of about 54 seconds. The fluence in 150 - 1000 keV
was (6.0 +/- 0.7) x 10^-6 erg/cm^2. The 1-s peak flux measured from T0+9s was
0.78 +/- 0.12 photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-7s to T0+47s
is fitted by a single power-law with a photon index of 1.83 +/- 0.18
in the 150 - 1000 keV range (chi^2/d.o.f = 6.1/11). All the quoted errors are at statistical
90% confidence level, in which the systematic uncertainties are not included.
The light curves with 1/64 sec time resolution for this burst are now available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html