GCN Circular 21476
Subject
LIGO/Virgo G297595: SPI-ACS/INTEGRAL data investigations
Date
2017-08-14T14:39:09Z (7 years ago)
From
Alexei Pozanenko at IKI,Moscow <grbgw.iki@gmail.com>
A. Pozanenko (IKI), P. Minaev (IKI),
E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GW
follow-up collaboration:
We investigated data of SPI-ACS/INTEGRAL data around LIGO/Virgo trigger
#G297595 (LIGO/Virgo collaboration). The small peak with duration of
about 10 seconds starting 1.5 seconds before the time of the trigger
2017-08-14 (UTC) 10:30:43 is detected. Significance of the peak is 3.5
sigma and the significance is estimated using local background
dispersion +/- 2000 seconds around the peak. The center of the
LIGO/Virgo trigger localization (R.A.=02h44m Dec.-45d29m ) is off-axis
of SPI detector of 78 degrees, which is nearly optimal for maximum
sensitivity of the SPI-ACS detector. The fluence of the peak can be
estimated as (4.0 +/- 1.2)*10^-7 erg/��m2. While the more accurate two
parameter chance probability will be estimated we note that within
investigated interval +/- 2000 s around the LIGO/Virgo trigger we do not
find any more significant peak with the duration of 10 seconds.
The light curve of the peak can be found at
http://grb.rssi.ru/GRB170814A/G297595_SPI-ACS_LC.png