GCN Circular 7884
Subject
Konus-Wind observation of GRB 080613B
Date
2008-06-15T15:01:08Z (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 080613B (Swift-BAT trigger
#313954: Markwardt et al., GCN 7873, Ukwatta et al., GCN 7876) triggered
Konus-Wind at T0=40358.636 s UT (11:12:38.636).
The burst light curve shows a multipeaked structure with a duration of ~30s.
As observed by Konus-Wind the burst
had a fluence of 2.21(-0.38, +0.44)x10^-5 erg/cm2,
and a 256-ms peak flux measured from T0-0.144 s
of 4.76(-1.24, +1.39)x10^-6 erg/cm2/s
(both in the 20 keV - 3 MeV energy range).
The time-integrated spectrum of the burst
(from T0 to T0+33.024 s) is well fitted (in the 20 keV-3 MeV range)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.05 +/- 0.18
and Ep = 733(-200, +285) keV (chi2 = 56.6/65 dof).
Fitting by GRBM (Band) model yields the same alpha and Ep,
and only an upper limit on the high energy photon index: beta < -2.05
(chi2 = 56.5/64 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.rssi.ru/LEA/GRBs/GRB080613_T40358/