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Towards an accurate Virgo gravitational wave strain reconstruction for real-time multi-messenger astronomy

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In August 2017, the first LIGO-Virgo joint observation of gravitational waves coming from a neutron star inspiral and a gamma ray burst, followed by an optical signal, opened a new chapter of astronomy. Besides confirming binary neutron star mergers as progenitors of short gamma ray bursts, new kinds of measurements have been made, from general relativity tests to independent determination of the Hubble constant. The third LIGO-Virgo observation run has started in April 2019 and will be completed in May 2020. This run is marked by weekly detections of binary black hole coalescences and by few candidates for coalescences including at least one neutron star. Within minutes, such detection generates public alerts to trigger multi-messenger observations of the sources.

For every Observing Run, an important detector calibration activity is needed to reconstruct the gravitational wave signal from various signals measured within the interferometer. Having more and more detections in the coming years, the precision of the detector calibration and the precision of the gravitational wave signal reconstruction will need to be better controlled. In addition, the inter-calibration of the detectors LIGO, Virgo and Kagra is of main importance to properly estimate the parameters of the sources detected by the worldwide network.

o Level : Master 2 internship, can be followed by a PhD

o Date of the internship : spring 2020

o Supervisor : Loïc Rolland

o Phone : 04 50 09 55 18

o e-mail :

o Team members : D. Buskulic, R. Flaminio, R. Gouaty, F. Marion, T. Regimbau, L. Rolland, E. Tournefier, D. Verkindt, M. Was

Detailed description :