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A neutron-star black-hole merger (NSBH merger, aka black-hole neutron-star merger, BHNS merger), the joining of a neutron star and a black hole occurs when the orbit of a neutron-star black-hole binary becomes sufficiently small that gravitational waves sap energy from the orbit producing a runaway orbital decay. When the two merge, a gravitational wave event may result, and the ground gravitational-wave detectors, LIGO and Virgo can detect them within a certain radius. Up until now, black hole mergers have been detected far more often: out of 60+ GW detections of Ligo operating runs O1-O3, only three are identified as NSBH mergers (and only three, neutron star mergers).