TITLE: GCN CIRCULAR NUMBER: 16345 SUBJECT: Konus-Wind observation of GRB 140529A DATE: 14/05/30 14:28:45 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, and T. Cline on behalf of the Konus-Wind team, report: The long-duration, soft spectrum GRB 140529A (Cummings, GCN 16340) triggered Konus-Wind at T0=34086.312 s UT (09:28:06.312). The burst light curve shows a single peak with a total duration of ~3 s. The emission is seen up to ~1 MeV. As observed by Konus-Wind, the burst had a fluence of 2.6(-0.3,+0.3)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.248 s, of 1.7(-0.4,+0.4)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 1 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.50(-0.45,+0.54), and Ep = 52(-31,+17) keV, chi2 = 66/50 dof. Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.92 (chi2 = 66/49 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140529_T34086/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.