GCN Circular 37832
Subject
Konus-Wind detection of GRB 241018A
Date
2024-10-21T15:16:18Z (3 days ago)
From
Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>
Via
legacy email
D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The long GRB 241018A (SVOM detection: Atteia et al., GCN 37812)
triggered Konus-Wind (KW) at T0=42881.464 s UT (11:54:41.464).
The burst light curve shows a multi-peaked structure,
which starts at ~T0-3 s, peaks at ~T0+4 s,
and has a total duration of ~12 s.
The emission is seen up to ~3 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB241018_T42881/
As observed by Konus-Wind, the burst had
a fluence of (1.22 ± 0.18)x10^-5 erg/cm^2 and
a 64-ms peak energy flux, measured from T0 + 4.224 s,
of (5.34 ± 0.64)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+8.448 s)
is best fit in the 20 keV - 15 MeV range
by a GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -1.12 (-0.21,+0.27),
the high energy photon index beta = -2.49 (-0.29,+0.18),
the peak energy Ep = 110 (-14,+16) keV,
chi2 = 78/86 dof.
All the quoted errors are estimated at the 90% confidence level.
All the presented results are preliminary