GCN Circular 21746
Subject
LIGO/Virgo G298048: Konus-Wind observations
Date
2017-08-29T10:55:08Z (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 time of the
LIGO/Virgo event G298048 (2017-08-17 12:41:04.446 UTC, hereafter T0;
LIGO/Virgo Collaboration GCN Circ. 21509) coincident with Fermi GBM
trigger 524666471 (Connaughton et al., GCN Circ. 21506, Goldstein et
al., GCN Circ. 21528).
Using waiting-mode data within the interval T0 +/- 100 s,
we found no significant (> 4 sigma) excess over the background
in both KW detectors on temporal scales from 2.944 s to 100 s.
For the 2.944 s interval containing GBM trigger and the
highest-probability localization region for the LIGO/Virgo G298048 (LVC,
GCN Circ. 21513) we estimate an upper limit (90% conf.) on the 10 keV ���
10 MeV fluence to 3.0x10^-7 erg/cm^2 for a burst lasting less than 2.944
s and having the spectrum reported by Goldstein et al. (an exponentially
cut off power law, CPL, with alpha =-0.9 and Ep=128 keV).
For a typical short GRB spectrum (CPL with alpha=-0.5 and Ep=500 keV),
the limiting fluence is 6.9x10^-7 erg/cm^2 (10 keV ��� 10 MeV).
All the quoted values are preliminary.