TITLE: GCN CIRCULAR NUMBER: 38429 SUBJECT: Konus-Wind detection of GRB 241130A DATE: 24/12/03 12:50:12 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 long GRB 241130A (Fermi-GBM detection: The Fermi GBM team, GCN 38405, Sharma et al., GCN 38421; EIRSAT-1 GMOD Detection: McDermott et al., GCN 38423; IPN triangulation: Ridnaia et al., GCN 38424) triggered Konus-Wind (KW) at T0=83628.376 s UT (23:13:48.376).
The burst light curve shows a single, FRED-like pulse, which starts at ~T0-0.5 s, peaks at ~T0+0.3 s, and has a total duration of ~10 s. The emission is seen up to ~2 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB241130_T83628/
As observed by Konus-Wind, the burst had a fluence of (1.52 ± 0.21)x10^-5 erg/cm^2 and a 64-ms peak energy flux, measured from T0 + 0.384 s, of (1.77 ± 0.22)x10^-5 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 power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.25(-0.08,+0.09) and Ep = 663(-128,+185) keV (chi2 = 66/81 dof). Fitting this spectrum by a Band function yields the same values of alpha and Ep, and an upper limit on the high energy photon index beta of -2.4 (chi2 = 66/80 dof).
All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.
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