TITLE: GCN CIRCULAR NUMBER: 17823 SUBJECT: Konus-Wind observation of GRB 150514A DATE: 15/05/18 15:01:37 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 150514A (Fermi-LAT detection: Kocevski & Arimoto , GCN 17816; Fermi-GBM detection: Roberts, Zhang & Meegan GCN 17819) triggered Konus-Wind at 66905.130 s UT (18:35:05.130). The KW light curve shows a single pulse with a duration of ~10 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/GRB150514_T66905/ As observed by Konus-Wind, the burst had a fluence of 3.7(-0.7,+0.7)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.448 s, of 3.4(-0.6,+0.6)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 cutoff power law with the following model parameters: the photon index alpha = -1.44(-0.29,+0.33), and the peak energy Ep = 60(-14,+10) keV, chi2 = 87/89 dof. Fitting this spectrum with the GRB (Band) function yields the following model parameters: the low-energy photon index alpha = -1.25 (-0.23,+0.26), the high energy photon index beta < -2.52 (upper limit), the peak energy Ep = 58 (-9, +9) keV, chi2 = 85/88 dof. Assuming the redshift z=0.807 (de Ugarte Postigo et al., GCN 17822) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, and Omega_Lambda = 0.73, we estimate the following rest-frame parameters: the isotropic energy release E_iso is ~6.3x10^51 erg, the peak luminosity L_iso is ~1.0x10^52 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is ~108 keV. All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.