TITLE: GCN CIRCULAR NUMBER: 19539 SUBJECT: Konus-Wind observation of GRB 160612A DATE: 16/06/15 13:59:33 GMT FROM: Anastasia Tsvetkova at Ioffe Institute A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline on behalf of the Konus-Wind team, report: The short-duration, hard-spectrum GRB 160612A (Fermi GBM detection: Burns, Meegan & Jenke, GCN 19531; IPN triangulation: Kozlova et al., GCN 19535; BAT detection and localization: Lien & Palmer, GCN 19537) triggered Konus-Wind at T0=72767.893 s UT (20:12:47.893). The burst light curve shows a single pulse with a total duration of ~0.2 s. As observed by Konus-Wind, the burst had a fluence of 1.02(-0.13,+0.12)x10^-6 erg/cm2 and a 16-ms peak flux, measured from T0-0.074 s, of 1.16(-0.26,+0.26)x10^-5 erg/cm2/s (both in the 20 - 1000 keV energy range). Since a major fraction of the burst counts was accumulated before the trigger, the spectral analysis was performed using the KW 3-channel light curve data. Modeling the 3-channel time-integrated spectrum (measured from T0-0.128 s to T0+0.064 s) by the cutoff power law yields the following model parameters: the photon index alpha=-0.54(-0.38,+0.53), and the peak energy Ep=1.46(-0.62,+8.00) MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB160612_T72767/ All the quoted errors are at the 68% confidence level. All the quoted values are preliminary.