GCN Circular 8878
Subject
Konus-Wind observation of GRB 090201
Event
Date
2009-02-03T12:27:16Z (17 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.
Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind
team, report:
The long GRB 090201 (Swift-BAT trigger #341749: Oates et al., GCN
8865; Baumgartner et al., GCN 8870)
triggered Konus-Wind at T0=64020.275 s UT (17:47:00.275).
The burst light curve shows a multipeaked structure with a duration of
~110 s.
As observed by Konus-Wind the burst
had a fluence of 6.72(-0.54, +0.47)x10^-5 erg/cm2,
and a 64-ms peak flux measured from T0+11.728 s
of 7.30(-1.28, +1.24)x10^-6 erg/cm2/s
(both in the 20 keV - 2 MeV energy range).
The time-integrated spectrum of the burst
(from T0 to T0+107.520 s) is well fitted (in the 20 keV - 2 MeV
range) by GRB (Band) model for which:
the low-energy photon index is alpha = -0.97(-0.09, +0.10),
the high energy photon index beta = -2.80(-0.92, +0.29),
the peak energy Ep = 158(-12, +13) keV (chi2 = 51.0/59 dof).
All the quoted errors are at the 90% confidence level.
The Konus-Wind light curve of this GRB is available
at http://www.ioffe.ru/LEA/GRBs/GRB090201_T64020/