TITLE: GCN CIRCULAR NUMBER: 24727 SUBJECT: LIGO/Virgo S190602aq: upper limit in INTEGRAL SPI-ACS prompt observations DATE: 19/06/03 08:19:11 GMT FROM: Alexei Pozanenko at IKI, Moscow P. Minaev, A. Pozanenko, S. Grebenev, I. Chelovekov on behalf of IKI GRB FuN collaboration report: We used public data of SPI-ACS to perform a search for possible EM-counterpart of LIGO/Virgo S190602aq. Before and after trigger time of S190602aq we did not find any significant candidate (at the level more than 3 sigma) in time scales from 0.05 s up to 100 s. The angle between the center of the error box of the S190602aq localization by LIGO/Virgo and the SPI axis is 129 degrees, and the region of the LIGO probability is not occulted by the Earth. The 3 sigma upper limits in the energy range of 75 - 1000 keV are 1.2 * 10^-7 erg/cm2 (1 s time scale), and 1.2 * 10^-6 erg/cm2 (100 s time scale).