Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 24169

LIGO/Virgo S190425z: INTEGRAL prompt observation
2019-04-25T10:03:31Z (5 years ago)
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:

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.
Looking for U.S. government information and services? Visit