Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 22547

Konus-Wind observation of GRB 180324A
2018-03-26T13:27:09Z (6 years ago)
Dmitry Frederiks at Ioffe Institute <>
D. Frederiks, S. Golenetskii, R.Aptekar, M. Ulanov, D. Svinkin,
A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline,
on behalf of the Konus-Wind team, report:

GRB 180324A (Swift-BAT trigger 817345:
Sonbas et al., GCN 22524; Krimm et al., GCN 22533)
triggered Konus-Wind at T0=16629.939 s UT (04:37:09.939)

The burst light curve shows a weak pulse,
which started at ~T0-0.4 s and peaked at ~T0 s.
The total duration of the burst is ~0.7 s.
The emission is seen up to ~0.5 MeV.

As observed by Konus-Wind, the burst had a fluence of
(7.4 �� 2.1)x10^-7 erg/cm2 and a 64-ms peak energy flux,
measured from T0, of (1.8 �� 0.5)x10^-6 erg/cm2
(both in the 20 keV - 10 MeV energy range).

The burst spectrum (measured from T0 to T0+0.256 s)
is best fit in the 20 keV - 15 MeV range by a cutoff power-law
(CPL) function with the following model parameters:
the photon index alpha = -0.56(-0.71,+1.16),
and the peak energy Ep = 154(-38,+77) keV,
chi2 = 22/19 dof.
Fitting this spectrum with the GRB (Band) function yields
the same alpha and Ep, and an upper limit on beta of ~-2.2

The Konus-Wind light curve of this GRB is available at

All the quoted errors are estimated at the 90% confidence level.
All the presented results are preliminary.
Looking for U.S. government information and services? Visit