GCN Circular 14348
Subject
Konus-Wind observation of GRB 130327B
Event
Date
2013-03-28T09:37:10Z (13 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 long-duration GRB 130327B
(AGILE detection: Longo et al., GCN 14344;
Fermi-GBM detection: Chaplin and Fitzpatrick, GCN 14346;
Fermi-LAT detection: Ohno et al., GCN 14347)
triggered Konus-Wind at T0=30247.662s UT (08:24:07.662)
The light curve shows a multi-peaked structure
with a total duration of ~35 s.
The emission is seen up to 12 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB130327_T30247/
As observed by Konus-Wind, the burst
had a fluence of (5.6 � 0.5)x10-5 erg/cm2,
and a 64-ms peak flux, measured from T0+4.352s,
of (4.9 � 0.5)x10-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+40.704 s)
is best fit in the 20 keV - 15 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.59 � 0.08,
the high energy photon index beta = -2.65 � 0.25,
the peak energy Ep = 278 � 18 keV,
chi2 = 122/97 dof.
The spectrum at the maximum count rate (measured from T0 to T0+7.936 s)
is best fit in the 20 keV - 15 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.62 � 0.13,
the high energy photon index beta = -2.6 � 0.4,
the peak energy Ep = 314 � 39 keV,
chi2 = 97.6/92 dof.
All the quoted results are preliminary.