On 11/7/21, the LIGO-Virgo-KAGRA Collaboration released the results of the second-half of their third observing run (O3b). This third Gravitational-Wave Transient Catalog (GWTC-3) is the largest catalog of mergers involving black holes and neutron stars released thus far and includes events released in prior observing runs. Since the last catalog release (O3a) in October 2020, the collaboration reports an additional 35 gravitational wave events observed between November 2019 and March 2020, bringing to 90 the total number of observed events since LIGO/Virgo operations began. NASA Marshall Space Flight Center is a member of the LIGO Scientific Collaboration (LSC). MSFC’s LSC group provides noise characterization and artifact removal of the LIGO-Virgo data containing gravitational wave candidates.
