LIGO/Virgo G268556, G270580, G274296, and G275404: Konus-Wind observations
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.