GCN Circular 32938
Subject
Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
Date
2022-11-14T13:40:49Z (a year ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
A.Ridnaia, D. Frederiks, A.Lysenko, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The bright burst from SGR 1935+2154
(Fermi-GBM detection: Wood, GCN Circ. 32922)
triggered Konus-Wind at T0=57968.083 s UT (16:06:08.083)
on 2022 November 9.
The burst light curve shows a bright pulse
which starts at ~T0-0.246 s and has a duration of ~0.4 s.
The main pulse is followed, after a short period of
quiescence, by multiple weaker pulses in the interval
from ~T0+0.6 s to ~T0+1.3 s.
The emission is seen up to ~200 keV.
The Konus-Wind light curve of this burst is available at
http://www.ioffe.ru/LEA/SGRs/221109_T57968/
As observed by Konus-Wind, the burst
had a fluence of 2.37(-0.11,+0.11)x10^-6 erg/cm2,
and a 16-ms peak flux, measured from T0-0.064 s,
of 1.35(-0.14,+0.14)x10^-5 erg/cm2/s
(both in the 20 - 500 keV energy range).
The spectrum of the burst
(measured from T0 to T0+0.192 s)
is best fit in the 20 - 500 keV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -0.02(-0.82,+0.92)
and Ep = 28(-6,+4) keV (chi2 = 29/17 dof).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.