GCN Circular 12800
Subject
Konus-Wind observation of GRB 120102A
Date
2012-01-03T13:53:11Z (12 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@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 long GRB 120102A (Swift-BAT trigger=510922: Marshall et al., GCN
12794; Markwardt et al., GCN 12799) triggered Konus-Wind at T0=8181.530
s UT (02:16:21.530).
The burst light curve shows a single pulse with a duration of ~15 s.
There is a weak precursor marginally seen at ~T0-30 s.
As observed by Konus-Wind the burst had a fluence of
1.75(-0.26,+0.30)x10^-5 erg/cm2,
and a 256-ms peak flux measured from T0+3.536 s
of 5.56(-1.02, +1.12)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 = -1.47(-0.07, +0.09), and
Ep = 805(-180, +288) keV (chi2 = 68.4/73 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and only an upper limit on the high energy
photon index: beta < -2.04.
All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB120102_T08181/