TITLE: GCN CIRCULAR NUMBER: 45191 SUBJECT: Konus-Wind detection of GRB 260714B DATE: 26/07/21 15:33:10 GMT FROM: Valentina Panteleeva at Ioffe Institute <panteleevav228@gmail.com> V. Panteleeva, D. Frederiks, A. Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 260714B (Fermi-GBM detection: The Fermi GBM team, GCN 45161; Fermi-LAT detection: The Fermi GBM team, GCN 45162; AstroSat-CZTI detection: Pathak et al., GCN 45163; GECAM-B detection: Ren et al., GCN 45174; SVOM-GRM detection: Ren et al., GCN 45176; Insight-HXMT-HE detection: Luo et al., GCN 45188) triggered Konus-Wind at T0=66206.858 s UT (18:23:26.858). The burst light curve shows a multipeaked structure which starts at ~T0-0.4 s and has a total duration of ~15.5 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/GRB260714_T66206/ As observed by Konus-Wind, the burst had the total fluence of 3.09(-0.20,+0.23)x10^-5 erg/cm2, and the 64-ms peak flux, measured from T0+2.640 s, of 1.39(-0.15,+0.16)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+15.360 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.07(-0.04,+0.04), the high energy photon index beta = -3.61(-6.39,+0.71), the peak energy Ep = 595(-44,+55) keV (chi2 = 122/94 dof). The spectrum near the maximum count rate (measured from T0+0.256 to T0+7.168 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.94(-0.05,+0.05), the high energy photon index beta = -2.97(-1.36,+0.38), the peak energy Ep = 605(-51,+56) keV (chi2 = 66/79 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/45191. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...