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GCN Circular 30418

Subject
Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
Date
2021-07-08T15:20:32Z (3 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
A. Ridnaia, D. Frederiks, S. Golenetskii, A. Lysenko,
D. Svinkin, A. Tsvetkova,  M. Ulanov, and T. Cline
on behalf of the Konus-Wind team, report:

The short burst from SGR 1935+2154
(GECAM detection: Xiao et al., GCN 30400;
Fermi GBM Observations: Hamburg et al., GCN 30407)
triggered Konus-Wind on 2021 July 7 at
T0=2015.644 s UT (00:33:35.644).

The burst light curve shows a single pulse with a total
duration of ~120 ms. The emission is seen up to ~200 keV.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/SGRs/210707_T02015/

As observed by Konus-Wind, the burst
had a fluence of 1.48(-0.08,+0.08)x10^-6 erg/cm2,
and a 2-ms peak flux, measured from T0-0.014 s,
of 1.94(-0.39,+0.39)x10^-5 erg/cm2/s
(both in the 20 - 500 keV energy range).

The time-averaged spectrum of the burst
(measured from T0 to T0+0.064 s)
is best fit in the 20 - 200 keV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with  alpha = 0.43(-0.80,+0.88)
and Ep = 38(-4,+3) keV (chi2 = 12/14 dof).

All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
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