TITLE: GCN CIRCULAR NUMBER: 38100 SUBJECT: Konus-Wind detection of GRB 241021A DATE: 24/11/06 13:13:48 GMT FROM: Dmitry Svinkin at Ioffe Institute svinkin@mail.ioffe.ru
V. Panteleeva, 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-duration GRB 241021A (IPN triangulation: Kozyrev et al., GCN 37847) triggered Konus-Wind at T0=53930.240 s UT (14:58:50.240).
The burst light curve shows a multipeaked structure which starts at ~T0-25 s and has a total duration of ~236 s. The emission is seen up to ~16 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB241021_T53930/
As observed by Konus-Wind, the burst had a fluence of 2.62(-0.21,+0.23)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+15.616 s, of 6.42(-1.49,+1.50)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+224 s) is best fit in the 20 keV - 16 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.09(-0.04,+0.04), the high energy photon index beta = -2.76(-0.60,+0.29), the peak energy Ep = 359(-25,+26) keV (chi2 = 103/97 dof).
The spectrum near the maximum count rate (measured from T0+15.360 to T0+21.504 s) is best fit in the 20 keV - 16 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.05(-0.07,+0.07), the high energy photon index beta = -2.54(-0.58,+0.26), the peak energy Ep = 474(-60,+71) keV (chi2 = 102/97 dof).
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
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