TITLE: GCN CIRCULAR NUMBER: 24169 SUBJECT: LIGO/Virgo S190425z: INTEGRAL prompt observation DATE: 19/04/25 10:03:31 GMT FROM: Antonio Martin-Carrillo at UCD,Space Science Group A. Martin-Carillo (UCD, Dublin) V. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland) J. Rodi (IAPS-Roma, Italy) A. Coleiro (APC, France) S. Mereghetti (INAF IASF-Milano, Italy) on behalf of the INTEGRAL multi-messenger collaboration: https://www.astro.unige.ch/cdci/integral-multimessenger-collaboration We investigated serendipitous INTEGRAL observations carried out at the time of the LIGO/Virgo burst candidate S190425z. The satellite was covering the entire localization region of the LIGO-Virgo event with a sensitivity depending on the source position. The best sensitivity depends on the source location. We investigated the SPI-ACS and IBIS/PICsIT light curves between -30 and +30 s from the trigger time (2019-04-25T08:18:05 UTC, T0) on temporal scales from 0.1 to 10s. In the SPI-ACS or IBIS/PICsIT data, we do not detect a significant signal. In SPI-ACS data, a marginally significant excess with S/N of 3.7 at is seen at T0+6s at the timescale of 1s. Further analysis is ongoing, and will be reported in the coming circulars. https://www.astro.unige.ch/cdci/integral/transients/lvc-s190425z