TITLE: GCN CIRCULAR NUMBER: 15081 SUBJECT: Konus-Wind observation of GRB 130804A DATE: 13/08/07 10:41:35 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline, on behalf of the Konus-Wind team, report: The bright, short-duration GRB 130804A (Fermi-GBM detection: Yu, Goldstein, and Pelassa, GCN 15070; IPN triangulation: Golenetskii at al., GCN 15075) triggered Konus-Wind at T0=1997.053 s UT (00:33:17.053). The burst light curve from ~T0-0.2 s to ~T0+1 s shows three major pulses with the brightest, hard-spectrum pulse peaked at ~T0. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB130804_T01997/ As observed by Konus-Wind, the burst had a fluence of (1.8 ± 0.2)x10-6 erg/cm2, and a 16-ms peak flux, measured from T0, of (3.4 ± 0.3)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The 3-channel time-integrated spectrum (measured from T0-0.256 to T0+1.024 s) can be modeled, in the 25 keV - 1.5 MeV range, by the cutoff power law with the following model parameters: the photon index alpha = -0.94 ± 0.06, and the peak energy Ep = 434 ± 37 keV. All the quoted results are preliminary.