First international joint observation of an underground gravitational-wave observatory, KAGRA, with GEO 600

The LIGO Scientific Collaboration, The Virgo Collaboration, The KAGRA Collaboration, Alberto Vecchio, Leonid Prokhorov, Patricia Schmidt, Geraint Pratten, Riccardo Maggiore, David Stops, Jiri Smetana, Kazuhiro Agatsuma, Riccardo Buscicchio, Amit Ubhi, Conor Mow-Lowry, Chris Moore

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We report the results of the first joint observation of the KAGRA detector with GEO600. KAGRA is a cryogenic and underground gravitational-wave detector consisting of a laser interferometer with three-kilometer arms, and located in Kamioka, Gifu, Japan. GEO600 is a British--German laser interferometer with 600 m arms, and located near Hannover, Germany. GEO600 and KAGRA performed a joint observing run from April 7 to 20, 2020. We present the results of the joint analysis of the GEO--KAGRA data for transient gravitational-wave signals, including the coalescence of neutron-star binaries and generic unmodeled transients. We also perform dedicated searches for binary coalescence signals and generic transients associated with gamma-ray burst events observed during the joint run. No gravitational-wave events were identified. We evaluate the minimum detectable amplitude for various types of transient signals and the spacetime volume for which the network is sensitive to binary neutron-star coalescences. We also place lower limits on the distances to the gamma-ray bursts analysed based on the non-detection of an associated gravitational-wave signal for several signal models, including binary coalescences. These analyses demonstrate the feasibility and utility of KAGRA as a member of the global gravitational-wave detector network.
Original languageEnglish
Article number063F01
JournalProgress of Theoretical and Experimental Physics
Issue number6
Publication statusPublished - 30 Apr 2022


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