# GWTC-2.1: Deep extended catalog of compact binary coalescences observed by LIGO and Virgo during the first half of the third observing run

“GWTC-2.1: Deep extended catalog of compact binary coalescences observed by LIGO and Virgo during the first half of the third observing run” (2024), by R. Abbott et al. Physics and Astronomy research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: R. Abbott, T. D. Abbott, F. Acernese, K. Ackley, C. Adams, N. Adhikari, R. X. Adhikari, V. B. Adya, C. Affeldt, D. Agarwal et al.
- Published: January 5, 2024
- Field: Physics and Astronomy
- DOI: https://doi.org/10.1103/physrevd.109.022001
- Free PDF: https://hal.science/hal-04382662v1/file/2108.01045.pdf

## Abstract

GWTC-2.1 is a catalog of gravitational wave events from compact binary coalescences from the first half of the third observing run of Advanced LIGO and Advanced Virgo. It improves on GWTC-2, which covered the same period but with less refined analysis methods. GWTC-2.1 identifies 8 new events, all identified as sourced by binary black holes with one exception identified as a neutron star-black hole coalescence. These events expand significantly on the parameters characterizing the sources of observed gravitational-wave transients.

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