TITLE: GCN CIRCULAR NUMBER: 25306 SUBJECT: HAWC Burst Alert 1008846_957: Konus-Wind observations DATE: 19/08/09 14:26:22 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 HAWC burst alert (2019-08-06 13:20:48.0 UTC, hereafter T0; The HAWC Collaboration GCN Circ. 25284). No triggered KW event happened in the +/- 1 day interval centered at T0. Using waiting-mode data (20-1500 keV) within the interval T0 +/- 2000 s, we have found a single 13 s-long event at ~30 minutes before T0 with a signal-to-noise ratio of ~4.5 sigma in the KW detector observing the HAWC event position. For the remaining part of the T0 +/- 2000 s interval we estimate an upper limit (90% conf.) on the 10 keV – 1.5 MeV fluence to 9.0x10^-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 2.2x10^-7 erg/cm^2/s (10 keV - 1.5 MeV, 2.944 s scale). All the quoted values are preliminary.