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GCN Circular 12715

Subject
Konus-Wind observation of GRB 111222A
Date
2011-12-23T18:25:13Z (12 years ago)
From
Dmitry Frederiks at Ioffe Institute <fred@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 hard intense GRB 111222A
(localized by IPN: Hurley et al., GCN 12714)
triggered Konus-Wind at T0=53515.918s UT (14:51:55.918)

The light curve consists of a single multi-peaked pulse with
a total duration of ~300 ms.
The emission is seen up to ~3 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB111222_T53515/

As observed by Konus-Wind the burst
had a fluence of (7.2 � 0.7)x10-6 erg/cm2,
and a 16-ms peak flux, measured from T0 s,
of (5.1 � 0.7)x10-5 erg/cm2/s
(both in the 20 keV - 3 MeV energy range).

The spectrum of the burst (measured from T0 to T0+0.256 s)
is best fitted in the 20 keV - 3 MeV range
by a power law with exponential cutoff model, for which
alpha = -0.35 (-0.13, +0.14),
and Ep = 762(-89, +101) keV,
chi2 = 51.1/45 dof.

All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.
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