TITLE:   GCN CIRCULAR
NUMBER:  34269
SUBJECT: Konus-Wind detection of GRB 230723A
DATE:    23/07/26 15:06:31 GMT
FROM:    Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>

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 230723A
(Fermi GBM detection: The Fermi GBM team, GCN 34232;
AGILE/MCAL detection: Panebianco et al., GCN 34237;
IPN triangulation: Kozyrev et al., GCN 34258)
triggered Konus-Wind at T0=16725.802 s UT (04:38:45.802).

The burst light curve shows a multipeaked structure,
which starts at T0-0.346 s and has a total duration of ~0.62 s.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB230723_T16725/

As observed by Konus-Wind, the burst
had a fluence of 1.66(-0.06,+0.54)x10^-6 erg/cm2,
and a 16-ms peak flux, measured from T0-0.220 s,
of 8.56(-1.76,+3.29)x10^-6 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 T0-0.346 s to T0+0.620 s)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep),
yields alpha = -0.21(-0.26,+0.27) and Ep = 659(-99,+162) keV.

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