TITLE: GCN CIRCULAR NUMBER: 20604 SUBJECT: Konus-Wind observation of GRB 170202A DATE: 17/02/05 14:32:27 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 170202A (Swift-BAT trigger #736407: Racusin et al., GCN 20575; Barthelmy et al., GCN 20596; T0(BAT)=18:28:02.373 UT) was detected by Konus-Wind (KW) in the waiting mode. The light curve shows a double-peaked with a duration of ~30 s. Modeling the KW 3-channel time-integrated spectrum (from T0(BAT)+0.907 s to T0(BAT)+30.347 s) by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.16(-0.34,+0.59) and Ep = 247(-86,+166) keV. The energy fluence (20 keV-10 MeV) for this time interval is (5.9 ± 1.4)x10^-6 erg/cm2. Assuming the redshift z=3.645 (de Ugarte Postigo et al., GCN 20584) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, and Omega_Lambda = 0.73, we estimate the burst isotropic energy release E_iso to ~1.7x10^53 erg and the rest-frame peak energy of the time-integrated spectrum, Ep,z, to ~1150 keV. The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB170202A/ All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.