TITLE: GCN CIRCULAR NUMBER: 16495 SUBJECT: Konus-Wind observation of GRB 140629A DATE: 14/06/30 12:59:28 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.Lyssenko, and T. Cline on behalf of the Konus-Wind team, report: The long GRB 140629A (Swift-BAT trigger #602884: Lien et al., GCN 16477; Cummings et al., GCN 16481; T0(BAT)=14:17:30 UT) was detected by Konus-Wind in the waiting mode. The light curve shows a double-peaked structure which started ~4 s before the BAT trigger and lasted till ~T0(BAT)+22 s. The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB140629A/ As observed by Konus-Wind, the burst had a fluence of (3.4 ± 0.5)x10^-6 erg/cm2 and a 2.944-s peak energy flux, measured from ~T0(BAT)+13.450 s, of (4.7 ± 0.7)x10^-7 erg/cm2 (both in the 20 - 10000 keV energy range). Modeling the KW 3-channel time-integrated spectrum (from T0(BAT)-4.214 s to T0(BAT)+22.282 s) by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.42 ± 0.54, and Ep = 86 ± 17 keV. Modelling the 3-channel spectrum near the peak count rate (from T0(BAT)-13.450 s to T0(BAT)+16.394 s) by the CPL model yields alpha = -1.50 ± 0.23, and Ep = 156 ± 52 keV. Assuming the redshift z=2.275 (Moskvitin et al., GCN 16489; D'Avanzo et al., GCN 16493) 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 ~4.4x10^52 erg, the peak luminosity L_iso is ~2.0x10^52 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is ~283 keV. All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.