GCN Circular 20775
Subject
LIGO/Virgo G275697: Konus-Wind observations
Date
2017-02-28T15:08:13Z (8 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 time of the LIGO
event G275697 (2017-02-27 18:57:31.375 UTC, hereafter T0; LIGO/VIRGO
Collaboration GCN Circ. 20763).
No triggered KW event happened from ~5 days before to more than 10 hours
after T0. 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 the interval T0 +/- 100 s.
We estimate an upper limit (90% conf.) on the 10 keV ��� 10 MeV fluence to
7.8x10^-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 2.7x10^-7 erg/cm^2/s (10 keV - 10 MeV, 2.944 s scale).
All the quoted values are preliminary.