[vsnet-grb-info 5836] Konus-Wind observation of GRB 080319C

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7487
SUBJECT: Konus-Wind observation of GRB 080319C
DATE:    08/03/20 14:34:46 GMT
FROM:    Valentin Pal'shin at Ioffe Inst  <val at 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 long GRB 080319C (Swift-BAT trigger #306778: Pagani et al., GCN
7442, Stamatikos et al., GCN 7483)
triggered Konus-Wind at T0=44757.938 s UT (12:25:57.938).

The burst light curve shows a multipeaked structure
with a total duration of ~15 s.

As observed by Konus-Wind the burst
had a fluence of 1.50(-0.21, +0.34)x10^-5 erg/cm2,
and a 256-ms peak flux measured from T0+0.256 s
of 3.35(-0.70, +0.79)x10^-6 erg/cm2/s
(both in the 20 keV - 4 MeV energy range).

The time-integrated spectrum of the burst
(from T0 to T0+16.640 s) is well fitted (in the 20 keV-4 MeV range)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.20 +/- 0.10,
and Ep = 594(-131, +224) keV (chi2 = 79.3/73 dof).
Fitting by GRBM (Band) model yields:
the low-energy photon index is alpha = -1.01 +/- 0.13,
the high energy photon index beta = -1.87(-0.63, +0.15),
the peak energy Ep = 307(-92, +141) keV (chi2 = 76.1/72 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/GRB080319_T44757/