TITLE: GCN CIRCULAR NUMBER: 38205 SUBJECT: Konus-Wind detection of GRB 241107A (short/hard) DATE: 24/11/13 17:52:12 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 241107A (SVOM/GRM detection: Wang et al., GCN 38125; INTEGRAL/IBIS/PICsIT detection: Rodi et al., GCN 38164; IPN triangulation: Kozyrev et al., GCN 38165; INTEGRAL IBIS localization: Mereghetti et al., GCN 38172; Swift/BAT candidate arcminute localization: DeLaunay et al.: GCN 38177) triggered Konus-Wind (KW) at T0=84602.493 s UT (23:30:02.493).
The burst light curve starts with a bright, multi-peaked emission pulse with a duration of ~0.028 s, which is followed by a weaker, decaying emission. The total duration of the burst is ~0.160 s.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB241107_T84602/
As observed by Konus-Wind, the burst had a total fluence of 1.43(-0.33, +0.13)x10^-6 erg/cm^2 and a 16-ms peak energy flux, measured from T0-0.096 s, of 3.6 (-1.2, +0.2)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).
Since the bulk of the burst emission was detected before the trigger, the spectral analysis was performed using the KW 3-channel light curve data.
The time-averaged spectrum of the burst (measured from T0-0.048 s to T0+0.080 s) is best fit by a blackbody (BB) function with kT(BB) = 193 (-18, +20) keV. This spectrum can be also described by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with a hard photon index alpha = 1.32(-1.09,+2.7) and Ep = 760(-91,+390) keV.
The spectrum of the initial pulse alone (measured from T0-0.112 s to T0-0.080 s) is best described by a blackbody function with kT(BB) = 251 (-31, +38) keV. The fluence in this pulse is 1.15(-0.38, +0.06)x10^-6 erg/cm^2, or ~80% of the total fluence.
All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.
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