TITLE: GCN CIRCULAR NUMBER: 35659 SUBJECT: Konus-Wind detection of GRB 240124B DATE: 24/02/02 15:58:30 GMT FROM: Alexandra Lysenko at Ioffe Institute alexandra.lysenko@mail.ioffe.ru
A. Lysenko, D. Frederiks, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 240124B (AstroSat CZTI detection: Joshi et al., GCN 35636; IPN triangulation: Ridnaia et al., GCN 35657) triggered Konus-Wind at T0=76473.999 s UT (21:14:33.999).
The burst light curve shows a single-pulse structure which starts at ~T0-1.1 s and has a total duration of ~4.0 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/GRB240124_T76473/
As observed by Konus-Wind, the burst had a fluence of 4.57(-0.85,+2.93)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.228s, of 4.33(-1.37,+3.93)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
A time-averaged spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.40(-0.35,+0.44) and Ep = 270(-94,+1040) keV (chi2 = 113/97 dof). Fitting by a GRB (Band) model yields close alpha and Ep, and an upper limit on the high energy photon index: beta < -1.9 (chi2 = 112/96 dof).
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
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