GCN Circular 24828
Subject
Konus-Wind observation of short/hard GRB 190610A
Date
2019-06-14T14:06:17Z (6 years ago)
From
Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>
D. Frederiks, S. Golenetskii, R.Aptekar, A. Kozlova,
A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The short GRB 190610A
(Swift-BAT detection: Evans et al., GCN 24775;
Insight-HXMT/HE detection: Cai et al., GCN 24782)
triggered Konus-Wind (KW) at T0=41263.560 s UT (11:27:43.560).
The light curve of the burst shows a single, multi-peaked pulse
with a total duration of ~0.6 s.
The emission is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB190610_T41263/
As observed by Konus-Wind, the burst had
a fluence of (7.65 �� 1.48)x10^-6 erg/cm^2 and
a 16-ms peak energy flux, measured from T0+0.080,
of (2.43 �� 0.31)x10^-5 erg/cm^2/s
(both in the 20 keV - 10 MeV energy range).
The spectrum of the burst (measured from T0 to T0+0.256 s)
is well fitted in the 20 keV - 20 MeV range
by a cutoff power-law (CPL) function with the following model
parameters: the photon index alpha = -0.28(-0.26,+0.33),
and the peak energy Ep = 903(-181,+251) keV, chi2 = 53/47 dof.
Fitting this spectrum with the GRB (Band) function yields
nearly the same alpha and Ep, and an upper limit on beta of -2.3.
All the quoted errors are estimated at the 90% confidence level.
All the presented results are preliminary.