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GCN Circular 4573

Subject
GRB 060117: Suzaku WAM observation of the prompt emission
Date
2006-01-24T17:45:26Z (18 years ago)
From
Kazutaka Yamaoka at Aoyama Gakuin U <yamaoka@phys.aoyama.ac.jp>
Y.Terada (RIKEN), K.Yamaoka, S.Sugita (Aoyama Gakuin U.), 
M.Ohno, T.Takahashi, Y.Fukazawa (Hiroshima U.), 
K.Abe, Y.Endo, S. Hong, K.Onda, M.Tashiro (Saitama U.), 
G.Sato, K.Nakazawa, T.Takahashi (ISAS/JAXA), R.Miyawaki, 
M.Kokubun, K.Makishima (Univ. of Tokyo) and the HXD-II team

The bright and long burst, GRB 060117 (Swift-BAT trigger 
#177666; Campana et al., GCN 4533), triggered the Suzaku 
Wide-band All-sky Monitor (WAM) which is sensitive to an 
energy band of 50 keV - 5 MeV at 06:50:00 (UT). 
The observed light curve shows multi-peak structures
with a duration (T90) of 16 seconds. 
The fluence in 100 - 1000 keV was (1.5 +/- 0.1)X10^-5 erg/cm2. 
The 1-s peak flux was 9.2 +/- 0.4 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 2.5 +/- 0.2.

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.
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