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GCN Circular 35699

Subject
Konus-Wind detection of GRB 240125A
Date
2024-02-07T14:51:18Z (16 days ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
Via
legacy email
A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,
A. Tsvetkova,  M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:

The short-duration GRB 240125A
(Glowbug gamma-ray detection: Cheung et al., GCN 35630;
AstroSat CZTI detection: Joshi et al., GCN 35637;
CALET CGBM detection: Marrocchesi et al., GCN 35639;
GRBAlpha detection: Dafcikova et al., GCN 35645;
IPN triangulation: Kozyrev et al., GCN 35652)
triggered Konus-Wind at T0=34503.601 s UT (09:35:03.601).

The burst light curve shows a multipeaked structure
which starts at ~T0-0.5 s and has a total duration of ~1.0 s.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB240125_T34503/

As observed by Konus-Wind, the burst
had a fluence of 4.79(-1.52,+5.06)x10^-6 erg/cm2,
and a 16-ms peak flux, measured from T0-0.220 s,
of 1.13(-0.57,+1.27)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

Since the main fraction of the burst emission was detected
before the trigger, the spectral analysis was performed using
the KW 3-channel light curve data.

Modelling the KW 3-channel time-integrated spectrum
(measured from T0-0.512 s to T0+0.448 s)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep),
yields alpha = 0.01(-0.59,+1.53) and Ep = 982(-418,+1876) keV.

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


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