The National Centre for Nuclear Research is participating in LIGO-Virgo Science Collaboration devoted to research on gravitational waves since 2008. Head of gravitational wave research group is Prof. Andrzej Królak. The group is doing research on continuous gravitational wave signals and multi-messenger astronomy. The group have heavily contributed to first direct detection of gravitational waves (2015) and first observation of electromagnetic counterpart to gravitational wave transient event (2017).