TITLE: GCN CIRCULAR NUMBER: 44998 SUBJECT: Konus-Wind detection of GRB 260617A DATE: 26/06/19 12:29:15 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 260617A (Fermi-GBM detection: Fermi GBM team, GCN 44969; Godwin & Meegan, GCN 44972; IPN triangulation: Kozyrev et al., GCN 44982; CALET-GBM detection: Torii et al., GCN 44989) triggered Konus-Wind at T0=77808.934 s UT (21:36:48.934). The burst light curve shows a multi-peaked pulse, which starts at ~T0-64 ms and has a total duration of ~150 ms. 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/GRB260617_T77808/ As observed by Konus-Wind, the burst had the total fluence of 1.28(-0.16,+0.19)x10^-6 erg/cm2, and the 16-ms peak flux, measured from T0-0.060 s, of 1.73(-0.36,+0.38)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). Since the brightest peak of the burst light curve 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 T0-0.064 s to T0+0.084 s) by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), yields alpha = -0.26(-0.32,+0.40) and Ep = 537(-85,+129) keV. All the quoted errors are at the 68% confidence level. All the quoted values are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/44998. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...