TITLE: GCN CIRCULAR NUMBER: 21476 SUBJECT: LIGO/Virgo G297595: SPI-ACS/INTEGRAL data investigations DATE: 17/08/14 14:39:09 GMT FROM: Alexei Pozanenko at IKI,Moscow 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/сm2. 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