TITLE: GCN CIRCULAR NUMBER: 17660 SUBJECT: Konus-Wind observation of GRB 150330A DATE: 15/04/02 08:02:27 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, very bright GRB 150330A (Fermi-GBM detection: Stanbro, GCN 17568 IPN triangulation: Hurley et al., GCN 17659) triggered Konus-Wind at T0=71538.572 s UT (19:52:18.572). The light curve starts with a double-peaked pulse lasting from ~T0 to ~T0+10 s followed by a bright multi-peaked structure from ~T0+97 s to ~T0+195 s. The emission is seen up to ~15 MeV. As observed by Konus-Wind, the burst had a fluence of 2.1(-0.2,+0.2)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+130.560 s, of 3.4(-0.1,+0.1)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum (measured from T0 to T0+194.560 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 = -0.96 (-0.07,+0.07), the high energy photon index beta = -2.16 (-0.11,+0.08), the peak energy Ep = 222 (-20,+21) keV, chi2 = 85/97 dof. The spectrum near the peak count rate (measured from T0+129.536 to T0+131.072 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 = -0.72 (-0.09,+0.09), the high energy photon index beta = -1.98 (-0.08,+0.06), the peak energy Ep = 341 (-44,+52) keV, chi2 = 107/96 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150330_T71538/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.