TITLE:   GCN CIRCULAR
NUMBER:  43701
SUBJECT: Konus-Wind detection of GRB 260127B
DATE:    26/02/11 17:39:39 GMT
FROM:    Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>

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

The short-duration GRB 260127B
(Fermi-GBM detection: The Fermi GBM team, GCN 43533;
Trigg, GCN 43573;
IPN triangulation: Ridnaia et al., GCN 43559;
AstroSat-CZTI detection: ,GCN 43576;
GECAM-B observation: Ren et al., GCN 43597;
Insight-HXMT/HE detection: Ren et al., GCN 43598)
triggered Konus-Wind at T0=72154.163 s UT (20:02:34.163).

The burst light curve shows a multipeaked structure,
which starts at ~T0-0.1 s and has a total duration of ~0.3 s.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB260127_T72154/

As observed by Konus-Wind, the burst
had a fluence of 2.09(-0.27,+0.38)x10^-6 erg/cm2,
and a 16-ms peak flux, measured from T0+0.062 s,
of 1.80(-0.40,+0.51)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The time-averaged spectrum of the burst
(measured from T0 to T0+0.128 s)
is best fit in the 20 keV - 1.3 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with  alpha = -0.21(-0.27,+0.31)
and Ep = 796(-151,+261) keV (chi2 = 24/25 dof).

All the quoted errors are at the 68% confidence level.
All the quoted values are preliminary.