Konus-Wind detection of GRB 240205A (short)
Abstract
The short-duration GRB 240205A (Fermi GBM Final Real-time Localization: GCN 35679; Glowbug gamma-ray detection: Cheung et al., GCN 35707; IPN triangulation: Svinkin et al., GCN 35710) triggered Konus-Wind at T0=73586.689 s UT (20:26:26.689). The burst light curve shows a single pulse, which starts at ~T0-0.2 s and has a total duration of ~0.45 s. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240205_T73586/ As observed by Konus-Wind, the burst had a fluence of 5.45(-0.84,+0.89)x10^-7 erg/cm2, and a 16-ms peak flux, measured from T0-0.016 s, of 4.13(-0.92,+1.08)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). Since the brightest part 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 T0-0.192 s to T0+0.256 s) by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), yields alpha = -0.10(-0.38,+0.48) and Ep = 241(-46,+52) keV. Modelling the KW 3-channel spectrum near the peak count rate (measured from T0-0.064 s to T0) by the CPL model yields alpha = -0.30(-0.48,+0.64) and Ep = 317(-82,+136) keV. All the quoted errors are at the 68% confidence level. All the quoted values are preliminary.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2024
- Bibcode:
- 2024GCN.35713....1F