Konus-Wind detection of GRB 220519A
Abstract
The short-duration GRB 220519A (IPN triangulation: Kozyrev at al., GCN Circ. 32072) triggered Konus-Wind at T0=42339.403 s UT (11:45:39.403). The burst light curve shows a single emission pulse, which starts at T0-0.1 s and has a total duration of ~0.7 s. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB220519_T42339/ As observed by Konus-Wind, the burst had a fluence of 1.66(-0.02,+0.48)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0-0.048 s, of 6.05(-3.24,+3.66)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). Since the main fraction of the burst emission was detected before the trigger, the spectral analysis was performed using the KW 3-channel light curve data. Modelling the KW 3-channel time-integrated spectrum (measured from T0-0.096 s to T0+0.640 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), yields alpha = -0.13(-0.35,+0.44) and Ep = 507(-77,+117) keV. All the quoted errors are at the 68% confidence level. All the quoted values are preliminary.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- May 2022
- Bibcode:
- 2022GCN.32073....1R