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GCN Circular 20794

Subject
LIGO/Virgo G268556, G270580, G274296, and G275404: Konus-Wind observations
Date
2017-03-02T14:42:59Z (7 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
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.
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