TITLE: GCN CIRCULAR NUMBER: 19618 SUBJECT: Konus-Wind observation of GRB 160620A DATE: 16/06/29 11:04:58 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 short GRB 160620A (IPN triangulation: Hurley et al., GCN 19594) triggered Konus-Wind at T0=18380.236 s UT (05:06:20.236). The light curve shows a single pulse which starts at ~T0-0.256 s, peaks at ~T0+0.608, and have a total duration of ~1.5 s. The emission is seen up to ~3 MeV. As observed by Konus-Wind, the burst had a fluence of 4.8(-0.6,+1.1)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.608 s, of 9.4(-0.6,+1.0)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum (measured from T0 to T0+8.448 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 = -0.63 (-0.23,+0.35), the high energy photon index beta = -3.41 (-6.59,+0.91), the peak energy Ep = 158 (-27,+23) keV, chi2 = 106/97 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB160620_T18380/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.