TITLE: GCN CIRCULAR NUMBER: 20794 SUBJECT: LIGO/Virgo G268556, G270580, G274296, and G275404: Konus-Wind observations DATE: 17/03/02 14:42:59 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: Konus-Wind (KW) was observing the whole sky at the times of the LIGO events G268556, G270580, and G274296 (hereafter T0; LIGO/VIRGO Collaboration GCN Circ. 20364, 20486, and 20689, respectively). A waiting mode data gap (~100 s in duration) occurred at the time of the LIGO event G275404 (LIGO/VIRGO Collaboration GCN Circ. 20738), so it was excluded from the analysis. We found no significant (> 5 sigma) detection on temporal scales from 2.944 s to 100 s using waiting mode data from both KW detectors S1 and S2 within +/- 100 s from each of the LIGO triggers. The table below contains, for each of the triggers, estimates for upper limits (90% conf.) on the fluence (S) 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); and on the peak flux (Fpeak; on the 2.944 s scale) for a typical long GRB spectrum (the Band function with alpha=-1, beta=-2.5, and Ep=300 keV), both in the 10 keV - 10 MeV band. UID T0, UTC S* Fpeak** G274296 2017-02-17 06:05:53.050 9.6 3.2 G270580 2017-01-20 12:30:59.350 9.9 3.1 G268556 2017-01-04 10:11:58.599 9.2 3.3 * in units of 10^-7 erg/cm2 ** in units of 10^-7 erg/cm2/s All the quoted values are preliminary.