GCN Circular 7784
Subject
Konus-Wind observation of GRB 080602
Event
Date
2008-06-02T16:44:25Z (18 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
and T. Cline on behalf of the Konus-Wind team report:
The second, most intense pulse of the GRB 080602 (Swift-BAT trigger
#312958: Beardmore et al., GCN 7781) triggered Konus-Wind
at T0=5486.229 s UT (01:31:26.229).
As observed by Konus-Wind the burst
had a fluence of 7.92(-1.45, +1.47)x10^-6 erg/cm2,
and a 256-ms peak flux measured from T0+1.280 s
of (1.92 +/- 0.58)x10^-6 erg/cm2/s
(both in the 20 keV - 1 MeV energy range).
The spectrum of the most intense part
(from T0 to T0+8.448 s) is well fitted (in the 20 keV-1 MeV range)
by a simple power law with the photon index of 1.48(-0.17, +0.18) (chi2
= 39.7/53 dof). We note that because of the derived photon index is <2,
the fluence is very sensitive to the upper boundary of the energy range.
Fitting by a power law with exponential cutoff model:
dN/dE ~ (E^-alpha)*exp(-E*(2-alpha)/Ep)
yields alpha = 0.96(-0.76, +0.52),
and only a lower limit on the peak energy: Ep > 226 keV
(chi2 = 36.6/52 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/GRB080602_T05486/