GCN Circular 4571
Subject
GRB 060111B: Suzaku WAM observation of the prompt emission
Date
2006-01-24T17:36:05Z (19 years ago)
From
Kazutaka Yamaoka at Aoyama Gakuin U <yamaoka@phys.aoyama.ac.jp>
G.Sato, K.Nakazawa, T.Takahashi (ISAS/JAXA),
K.Yamaoka, S.Sugita (Aoyama Gakuin U.), Y.Terada (RIKEN),
M.Ohno, T.Takahashi, Y.Fukazawa (Hiroshima U.),
K.Abe, Y.Endo, S. Hong, K.Onda, M.Tashiro (Saitama U.),
R.Miyawaki, M.Kokubun, K.Makishima (Univ. of Tokyo)
and the HXD-II team
The long burst, GRB 060111B (Swift-BAT trigger #176918;
Perri et al., GCN 4487), triggered the Suzaku Wide-band
All-sky Monitor (WAM) which is sensitive to an energy band
of 50 keV - 5 MeV at 20:15:41 (UT).
The WAM light curve exhibits a double peak structure
with a duration (T90) of 25 seconds.
The fluence in 100 - 1000 keV was (5.6 +/- 0.8)X10^-6 erg/cm2.
The 1-s peak flux was 1.0 +/- 0.2 photons/cm2/s
in the same energy range.
Preliminary result shows that the time-averaged spectrum
is well fitted by a single power law with a photon index
of 1.5 +/- 0.3.
All the quoted errors are at statistical 90% confidence level.
The WAM in-flight calibration is still under way, and systematic
errors, such as the flux calibration uncertainties of about 20%,
are not included in the errors.
The WAM light curve of this event is available at
http://www.astro.isas.ac.jp/suzaku/research/HXD-WAM/WAM-GRB/grb/grb_table.html
Further detailed analysis and the refinement are in progress.