Konus-Wind observation of GRB191202A
Abstract
The long-duration GRB191202A (AstroSat CZTI detection: Gaikwad et al., GCN 26326; Fermi GBM observation: Veres & Meegan, GCN 26329; Fermi-LAT detection: Kocevski et al., GCN 26330) triggered Konus-Wind at T0=74930.521 s UT (20:48:50.521). The burst light curve shows a multi-peaked structure which starts at ~T0-3.9 s and has a total duration of~17.6 s. The emission is seen up to ~1.3 MeV. As observed by Konus-Wind, the burst had a fluence of 2.78(-0.68,+0.76)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0+7.024 s, of 8.80(-2.80,+3.04)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+15.872 s) is best fit in the 20 keV - 1.3 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.22(-0.12,+0.22), the high energy photon index beta = -2.17(-1.00,+0.26), the peak energy Ep = 265(-87,+91) keV, chi2 = 46/59 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB191202_T74930/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
- Publication:
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GRB Coordinates Network
- Pub Date:
- December 2019
- Bibcode:
- 2019GCN.26344....1T