TITLE: GCN CIRCULAR NUMBER: 20256 SUBJECT: IceCube-161210: Konus-Wind upper limits DATE: 16/12/14 15:23:56 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R.Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report: Using Konus-Wind (KW) data, we have performed a search for a gamma-ray transient around the time of the cosmic neutrino candidate IceCube-161210 (Blaufuss, GCN 20247; https://gcn.gsfc.nasa.gov/notices_amon/80127519_128906.amon) No triggered KW event happened from ~6 days before to more than 4 days after the IceCube event time (2016-12-10 20:07:16 UT, hereafter T0). Using Konus-Wind waiting mode data in the interval T0 +/- 1000 s, we estimate an upper limit (90% conf.) on the 10 keV – 10 MeV fluence to ~1.2x10^-6 erg/cm^2 for a burst lasting less than 2.944 s and having a typical KW short GRB spectrum (an exponentially cut off power law with alpha =-0.5 and Ep=500 keV, Svinkin et al. 2016). For a typical long GRB spectrum (the Band function with alpha=-1, beta=-2.5, and Ep=250 keV), the corresponding limiting peak flux is ~3.2x10^-7 erg/cm^2/s (10 keV - 10 MeV, 2.944 s scale). All the quoted values are preliminary.