TITLE: GCN CIRCULAR NUMBER: 36627 SUBJECT: Konus-Wind detection of GRB 240603A DATE: 24/06/06 12:47:29 GMT FROM: Anna Ridnaia at Ioffe Institute ridnaia@mail.ioffe.ru
A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:
The short-duration GRB 240603A (GECAM-B detection: Wang & Xiong, GCN 36602; Fermi-GBM detection: The Fermi GBM team, GCN 36608; IPN triangulation: Kozyrev et al., GCN 36618) triggered Konus-Wind at T0=8857.191 s UT (02:27:37.191).
The burst light curve shows a single pulse, which starts at ~T0-0.3 s and has a total duration of ~1.1 s. The emission is seen up to ~4 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240603_T08857/
As observed by Konus-Wind, the burst had a fluence of 3.81(-0.02,+0.84)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.504 s, of 8.34(-2.03,+2.74)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
Since a significant fraction of the burst counts 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 T0-0.260 s to T0+0.784 s) by a power law with exponential cutoff (CPL) model, dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), yields alpha = -1.08(-0.68,+1.42) and Ep = 592(-82,+92) keV.
All the quoted errors are at the 68% confidence level. All the quoted values are preliminary.
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