Konus-Wind detection of GRB 230803A
Abstract
The long GRB 230803A (Fermi GBM detection: Fermi GBM team, GCN 34325; AstroSat CZTI detection: Navaneeth et al., GCN 34328; IPN triangulation: Kozyrev et al., GCN 34330) triggered Konus-Wind (KW) at T0=5229.064 s UT (01:27:09.064). The burst light curve shows a multi-peaked structure with a total duration of ~126 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/GRB230803_T05229/ As observed by Konus-Wind, the burst had a fluence of (7.59 ± 0.88)x10^-5 erg/cm^2 and a 64-ms peak energy flux, measured from T0 + 93.760 s, of (1.43 ± 0.13)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum (measured from T0+57.600 to T0+128.256 s) is best fit in the 20 keV - 15 MeV range by a GRB (Band) function with the following model parameters: the low-energy photon index alpha = -1.30 (-0.06,+0.08), the high energy photon index beta = -2.65 (-0.82,+0.30), the peak energy Ep = 256 (-31,+32) keV, chi2 = 112/97 dof. The spectrum near the peak count rate (measured from T0+90.368 to T0+95.488 s) is best fit in the 20 keV - 15 MeV range by a GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.93 (-0.06,+0.07), the high energy photon index beta = -2.32 (-0.20,+0.14), the peak energy Ep = 284 (-38,+40) keV, chi2 = 66/77 dof. All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- August 2023
- Bibcode:
- 2023GCN.34358....1F