GCN Circular 39024
Subject
Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
Date
2025-01-24T17:52:25Z (3 days ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
Via
Web form
A.Ridnaia, D. Frederiks, A.Lysenko, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
A bright burst from SGR 1E1841-045
(IPN triangulation: Svinkin et al., GCN 39022)
triggered Konus-Wind at T0=31634.552 s UT (08:47:14.552)
on 2025 January 23.
The burst light curve shows a bright pulse,
which starts at ~T0-100 ms and has a total duration of ~172 ms.
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/250123_T31634/
As observed by Konus-Wind, the burst
had a fluence of 2.30(-0.07,+0.07)x10^-6 erg/cm2,
and a 16-ms peak flux, measured from T0-0.054 s,
of 2.02(-0.14,+0.14)x10^-5 erg/cm2/s
(both in the 20 - 500 keV energy range).
The spectrum of the burst
(measured from T0-0.112 to T0+0.080 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 ~ -0.46 and Ep ~ 30 keV.
All the quoted errors are at the 68% confidence level.
All the quoted values are preliminary.