The “gravitational wave” group at IJCLab participates to several experiments to study gravitational-wave sources. The Virgo interferometer, installed in Italy, can detect gravitational waves directly. In the context of multi-messenger astronomy, the SVOM satellite and the GRANDMA telescope network perform an electromagnetic follow-up of gravitational-wave events. Finally, the CALVA test facility is used to study squeezed-light technics to improve the performance of gravitational-wave detectors.