TITLE: GCN CIRCULAR NUMBER: 22385 SUBJECT: Konus-Wind observation of GRB 180204A DATE: 18/02/05 12:16:14 GMT FROM: Anna Kozlova at Ioffe Institute A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report: The short-duration GRB 180204A (Swift-BAT detection and analysis: Page et al., GCN 22375; Cummings et al., GCN 22380; Fermi-GBM observation: Veres&Meegan, GCN 22378) triggered Konus-Wind at T0=9372.902 s UT (02:36:12.902). The burst light curve shows two peaks in the interval from ~T0-0.1 s to ~T0+1.1 s. The emission is seen up to ~10 MeV. As observed by Konus-Wind, the burst had a fluence of 3.81(-0.57,+0.66)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.038 s, of 2.95(-0.80,+0.87)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 best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.36(-0.29,+0.38) and Ep = 843(-177,+263) keV (chi2 = 37/45 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.5 (chi2 = 37/44 dof) The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180204_T09372/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.