TITLE: GCN CIRCULAR NUMBER: 44894 SUBJECT: Konus-Wind detection of GRB 260601A DATE: 26/06/10 13:16:20 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 260601A (Fermi-GBM detection: Fermi GBM team, GCN 44755, Holzmann Airasca et al., GCN 44760; Glowbug detection: Cheung et al., GCN 44763; GECAM-B detection: Wang et al., GCN 44778; SVOM-GRM detection: Wang et al., GCN 44793; CALET-GBM detection: Yamaoka et al., GCN 44817; IPN triangulation: Svinkin et al., GCN 44893) triggered Konus-Wind at T0=39609.166 s UT (11:00:09.166). The burst light curve shows a multipeaked structure which starts at ~T0 and has a total duration of ~0.2 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/GRB260601_T39609/ As observed by Konus-Wind, the burst had the total fluence of 3.05(-0.27,+0.29)x10^-6 erg/cm2, and the 16-ms peak flux, measured from T0+0.078 s, of 4.04(-0.53,+0.55)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+0.192 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.44(-0.13,+0.14) and Ep = 780(-91,+107) keV (chi2 = 36/39 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.6 (chi2 = 36/38 dof). 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/44894. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...