TITLE: GCN CIRCULAR NUMBER: 18019 SUBJECT: Konus-Wind observation of GRB 150710B DATE: 15/07/12 13:43:03 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 150710B (Swift-BAT ground detection: Cummings et al., GCN 18009) triggered Konus-Wind at T0=29133.922 s UT (08:05:33.922). The KW light curve shows a multi-peaked emission complex with a total duration of ~8.5 s. The emission is visible up to ~5 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150710_T29133/ As observed by Konus-Wind, the burst had a fluence of 1.1(-0.2,+0.2)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+4.032 s, of 6.8(-1.3,+1.2)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.81 (-0.23,+0.30), the high energy photon index beta = -2.27 (-0.33,+0.18), the peak energy Ep = 154 (-30,+37) keV, chi2 = 75/97 dof. All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.