GCN Circular 20939
Subject
LIGO/Virgo G277583: Konus-Wind observations
Date
2017-03-26T17:26:12Z (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 (2017-03-13 22:40:09.593 UTC, hereafter T0; LIGO/VIRGO
Collaboration GCN Circ. 20860).
No triggered KW event happened from ~2 days before to ~3 days
after T0. Using waiting mode data within the interval T0 +/- 100 s,
we also 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 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 3.0x10^-7 erg/cm^2/s (10 keV - 10 MeV, 2.944 s scale).
All the quoted values are preliminary.