GCN Circular 34139
Subject
Konus-Wind detection of GRB 220623A
Date
2023-07-03T19:54:02Z (10 months ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia,
Y. Temiraev, A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The long-duration GRB 220623A
(MAXI-GSC detection: Hagiwara et al., GCN 34068)
was detected by Konus-Wind (KW) in the waiting mode.
A Bayesian block analysis of the KW waiting mode data
in the 20-1500 keV band reveals a multi-peaked structure
which starts at ~T0 and ends at ~T0+580 s,
where T0 = T0(MAXI) = 07:23:37 UT.
The KW light curve of this burst is available at
http://www.ioffe.ru/LEA/GRBs/GRB230623A/
Modelling a time-integrated spectrum of the burst
by a power law (PL) model dN/dE ~ E^alpha
yields alpha = -2.18(-0.04,+0.05).
The spectrum near the peak count rate,
measured from T0+43.303 s to T0+75.687 s,
can be described by a power law with exponential cutoff (CPL) model
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.58(-0.13, +0.15) and Ep = 243(-57,+141) keV.
The total burst fluence is 5.77(-0.34,+0.52)x10^-5 erg/cm^2,
and the 2.944 s peak energy flux is 6.08(-0.97,+1.40)x10^-7 erg/cm^2.
(both in the 20 keV - 10 MeV energy range).
All the quoted errors are estimated at the 68% confidence level.
All the presented results are preliminary.