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Similar to binary neutron star systems, a neutron star can also be on a bound orbits with a black hole. Such black hole - neutron star systems have been observed for the first time in January 2020 with GW200105 and GW200115. Given the presence of matter the collision of a black hole neutron star system could in principle also be connected with electromagnetic counterparts, however, we have not been able to confidentially detect a short gamma-ray burst or a kilonova created from a black hole - neutron star collision.

For a material related to the black hole - neutron star mergers GW200105 and GW200115, please visit this page.