Abstract
In August 2017, advanced Virgo joined advanced LIGO for the end of the O2 run, leading to the first gravitational waves detections with the threedetector network. This paper describes the advanced Virgo calibration and the gravitational wave strain h(t) reconstruction during O2. The methods are the same as the ones developed for the initial Virgo detector and have already been described in previous publications; this paper summarizes the differences and emphasis is put on estimating systematic uncertainties. Three versions of the h(t) signal have been computed for the Virgo O2 run, an online version and two post-run reprocessed versions with improved detector calibration and reconstruction algorithm. A photon calibrator has been used to establish the sign of h(t) and to make an independent partial cross-check of the systematic uncertainties. The uncertainties reached for the latest h(t) version are 5.1% in amplitude, 40 mrad in phase and 20 s in timing.
| Original language | English |
|---|---|
| Article number | 205004 |
| Journal | Classical and Quantum Gravity |
| Volume | 35 |
| Issue number | 20 |
| Early online date | 26 Sept 2018 |
| DOIs | |
| Publication status | Published - 25 Oct 2018 |
Funding
The authors gratefully acknowledge the Italian Istituto Nazionale di Fisica Nucleare (INFN), the French Centre National de la Recherche Scientifique (CNRS) and the Foundation for Fundamental Research on Matter supported by the Netherlands Organisation for Scientific Research, for the construction and operation of the Virgo detector and the creation and support of the EGO consortium.
| Funders |
|---|
| Nederlandse Organisatie voor Wetenschappelijk Onderzoek |
| Institut National des Sciences de l'Univers, Centre National de la Recherche Scientifique |
| Centre National de la Recherche Scientifique |
| Istituto Nazionale di Fisica Nucleare |
Keywords
- calibration
- gravitational wave
- O2 observation run
- photon calibrator
- reconstruction
- Virgo
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