TITLE: GCN CIRCULAR NUMBER: 25369 SUBJECT: LIGO/Virgo S190814bv: Konus-Wind observations DATE: 19/08/16 15:29:04 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R.Aptekar, D. Frederiks, 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 time of the LIGO/Virgo event S190814bv (2019-08-14 21:10:39.013 UTC, hereafter T0; LIGO/Virgo Collaboration GCN Circ. 25324). No triggered KW event happened from ~20 hours before and up to ~2 days after T0. The closest waiting-mode event was ~1 hour before T0. Using waiting-mode data within the interval T0 +/- 10 s, we found no significant (> 5 sigma) excess over the background in both KW detectors on temporal scales from 2.944 s to 100 s. We estimate an upper limit (90% conf.) on the 20 - 1500 keV fluence to 5.9x10^-7 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). For a typical long GRB spectrum (the Band function with alpha=-1, beta=-2.5, and Ep=300 keV), the corresponding limiting peak flux is 1.7x10^-7 erg/cm^2/s (20 - 1500 keV, 2.944 s scale). All the quoted values are preliminary.