TITLE: GCN CIRCULAR NUMBER: 13354 SUBJECT: Konus-Wind observation of GRB 120603A DATE: 12/06/05 11:40:54 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 GRB 120603A (IPN detection and localization: Golenetskii at al., GCN 13353) triggered Konus-Wind at T0=37934.201s UT (10:32:14.201) The light curve shows a single pulse with a total duration of ~0.3 s. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120603_T37934/ As observed by Konus-Wind the burst had a fluence of (1.0 ± 0.1)x10-6 erg/cm2, and a 64-ms peak flux, measured from T0-0.064, of (6.2 ± 1.1)x10-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). Since almost the whole of the emission is seen before the trigger, no multichannel spectra are available for this burst. Modelling the 3-channel time-integrated spectrum (from T0-0.256 to T0) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.4 ± 0.2, and Ep = 560 ± 60 keV. All the quoted errors are estimated at the 1 sigma confidence level.