TITLE: GCN CIRCULAR NUMBER: 13371 SUBJECT: Konus-Wind observation of GRB 120617A DATE: 12/06/19 12:24:29 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The short-duration intense GRB 120617A (IPN localization: Golenetskii at al., GCN 13370) triggered Konus-Wind at T0=54167.025s UT (15:02:47.025) The light curve shows two pulses, a total duration of the burst is ~0.5 s. The emission is seen up to ~4 MeV. A spectral lag between G2(80-300 keV) and G1(20-80 keV) instrument's light curves is estimated to 28 +/- 4 ms (1 sigma). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120617_T54167/ As observed by Konus-Wind the burst had a fluence of 2.1(-0.2,+0.2)x10-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.256 s, of 1.5(-0.3,+0.4)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The spectrum of the burst (measured from T0 to T0+0.256 s) is well fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model, for which alpha = -0.95 (-0.4, +0.5), and Ep = 180(-40, +70) keV, chi2 = 12.6/22 dof. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.