GCN Circular 14565
Subject
Konus-Wind observation of GRB 130504B
Event
Date
2013-05-05T09:20:24Z (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 short-duration hard GRB 130504B
(Fermi-GBM detection: von Kienlin, GCN 14560;
IPN triangulation: Golenetskii et al., GCN 14561)
triggered Konus-Wind at T0=27119.723s UT (07:31:59.723)
The light curve shows a double-peaked structure
from ~T0-0.064 s to ~T0+0.368s.
The total duration of the burst is ~0.430 s
The emission is seen up to ~8 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB130504_T27119/
As observed by Konus-Wind, the burst
had a fluence of (9.3 � 0.9)x10-6 erg/cm2,
and a 16-ms peak flux, measured from T0+0.320s,
of (5.0 � 0.9)x10-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The spectrum of the burst (measured from T0 to T0+0.256 s)
is best fit in the 20 keV - 15 MeV range
by the cutoff power law with the following model parameters:
the photon index alpha = -0.50 � 0.13,
the peak energy Ep = 980 � 125 keV,
chi2 = 40/36 dof.
All the quoted results are preliminary.