Observation of Gravitational Waves from Two Neutron Star-Black Hole CoalescencesJanuary 1, 2021·LIGO Scientific Collaboration,Virgo Collaboration,KAGRA Collaboration· 0 min read Cite DOIpublicationLast updated on January 1, 2021 ← GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo during the First Half of the Third Observing Run January 1, 2021Population Properties of Compact Objects from the Second LIGO-Virgo Gravitational-Wave Transient Catalog January 1, 2021 →