TITLE:   GCN CIRCULAR
NUMBER:  38881
SUBJECT: Konus-Wind detection of GRB 250107D (short/hard)
DATE:    25/01/09 22:08:34 GMT
FROM:    Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>

D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,
A. Tsvetkova,  M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:

The short GRB 250107D (IPN triangulation: Kozyrev et al., GCN 38880)
triggered Konus-Wind (KW) at T0=19411.897 s UT (05:23:31.897).

The burst light curve shows a single, multi-peaked emission pulse
which starts at ~T0-0.112 s and has a duration of ~0.208 s.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB250107_T19411/

As observed by Konus-Wind, the burst had
the total fluence of 2.06(-0.34,+0.62)x10^-6 erg/cm^2
and a 16-ms peak energy flux, measured from T0-0.064 s,
of 1.99(-0.32,+0.59)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).

Since a major part of the burst emission was detected before the trigger time,
the time-averaged spectral analysis was performed using the KW 3-channel light curve data.
Modeling the 3-channel time-integrated spectrum (measured from T0-0.112 s to T0+0.096 s)
by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
yields alpha = -0.40 (-0.32, + 0.41) and Ep = 897(-203,+453) keV.

All the quoted errors are estimated at the 68% confidence level.
All the presented results are preliminary.