TITLE: GCN CIRCULAR NUMBER: 26613 SUBJECT: Konus-Wind observation of GRB 191227B DATE: 19/12/30 12:56:09 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, report: The short-duration GRB 191227B (IPN triangulation: Hurley et al., GCN Circ. 26612) triggered Konus-Wind at T0=62500.487 s UT (17:21:40.487). The burst light curve shows a multi-peaked structure which starts at ~T0 s and has a total duration of ~0.2 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB191227_T62500/ As observed by Konus-Wind, the burst had a fluence of 8.80(-1.42,+1.40)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.030 s, of 8.83(-2.12,+2.10)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+0.192 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.56(-0.21,+0.31), the high energy photon index beta = -2.35(-1.19,+0.38), the peak energy Ep = 985(-323,+373) keV (chi2 = 49/49 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.