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      Calibration of advanced Virgo and reconstruction of the detector strain h(t) during the observing run O3

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      Classical and Quantum Gravity
      IOP Publishing
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          Abstract

          The three advanced Virgo and LIGO gravitational wave detectors participated to the third observing run (O3) between 1 April 2019 15:00 UTC and 27 March 2020 17:00 UTC, leading to several gravitational wave detections per month. This paper describes the advanced Virgo detector calibration and the reconstruction of the detector strain h( t) during O3, as well as the estimation of the associated uncertainties. For the first time, the photon calibration technique as been used as reference for Virgo calibration, which allowed to cross-calibrate the strain amplitude of the Virgo and LIGO detectors. The previous reference, so-called free swinging Michelson technique, has still been used but as an independent cross-check. h( t) reconstruction and noise subtraction were processed online, with good enough quality to prevent the need for offline reprocessing, except for the two last weeks of September 2019. The uncertainties for the reconstructed h( t) strain, estimated in this paper in a 20–2000 Hz frequency band, are frequency independent: 5% in amplitude, 35 mrad in phase and 10 μs in timing, with the exception of larger uncertainties around 50 Hz.

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          Advanced Virgo: a second-generation interferometric gravitational wave detector

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            Advanced LIGO

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              Is Open Access

              GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo during the First Half of the Third Observing Run

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                Author and article information

                Contributors
                Journal
                Classical and Quantum Gravity
                Class. Quantum Grav.
                IOP Publishing
                0264-9381
                1361-6382
                January 21 2022
                February 17 2022
                January 21 2022
                February 17 2022
                : 39
                : 4
                : 045006
                Article
                10.1088/1361-6382/ac3c8e
                5c3bf8e2-fb1f-4876-90ae-35fcb63abae3
                © 2022

                https://iopscience.iop.org/page/copyright

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