[vsnet-grb-info 12290] Konus-Wind observation of GRB 120817B
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Aug 18 20:45:24 JST 2012
TITLE: GCN CIRCULAR
NUMBER: 13674
SUBJECT: Konus-Wind observation of GRB 120817B
DATE: 12/08/18 11:45:16 GMT
FROM: Dmitry Frederiks at Ioffe Institute <fred at mail.ioffe.ru>
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,
P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf
of the Konus-Wind team, report:
The short-duration hard-spectrum intense GRB 120817B
(IPN localization: Golenetskii at al., GCN 13670;
Fermi/GBM detection: Xiong, GCN 13671)
triggered Konus-Wind at T0=14553.388s UT (04:02:33.388)
The light curve shows a single pulse,
a total duration of the burst is ~0.08 s.
The emission is seen up to ~6.5 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB120817_T14553/
As observed by Konus-Wind the burst
had a fluence of 4.1(-1.0,+1.1)x10-6 erg/cm2,
and a 16-ms peak flux, measured from T0,
of 1.2(-0.3,+0.3)x10-4 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The spectrum of the burst (measured from T0 to T0+0.064 s)
is best fit in the 20 keV - 7 MeV range
by a power law with exponential cutoff model, for which
alpha = -0.82 (-0.18, +0.21),
and Ep = 1740(-520, +890) keV,
chi2 = 7.5/12 dof.
All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.
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