TITLE: GCN CIRCULAR NUMBER: 20678 SUBJECT: Konus-Wind observation of GRB 170214A DATE: 17/02/15 14:44:18 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report: The long GRB 170214A (Fermi-GBM detection: Mailyan & Meegan, GCN 20675; Fermi-LAT detection: Racusin et al., GCN 20676) triggered Konus-Wind at T0=56076.276 s UT (15:34:36.276) The light curve shows count rate increase around ~T0-50 s followed by a bright, multi-peaked structure which starts at ~T0-14 s and has a total duration of ~150 s. The emission is seen up to ~10 MeV. As observed by Konus-Wind, the burst had a fluence of (2.41 ± 0.17)x10^-4 erg/cm2 and a 64-ms peak energy flux, measured from T0+52.480, of (8.77 ± 0.13)x10^-6 erg/cm2 (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum (measured from T0 to T0+147.968 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 = -0.70 (-0.06,+0.07), the high energy photon index beta = -2.61 (-0.27,+0.16), the peak energy Ep = 330 (-19,+21) keV, chi2 = 96/97 dof. The spectrum near the peak count rate (measured from T0+47.360 to T0+56.248 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 = -0.75 (-0.12,+0.15), the high energy photon index beta = -2.56 (-1.15,+0.33), the peak energy Ep = 412 (-68,+73) keV, chi2 = 110/97 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB170214_T56076/ All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary. [GCN OPS NOTE(15feb17): Per author's request, the value for the peak energy flux was changed from "10^-5" to "10^-6".]