Gravitational waves don't go on holiday! The week of the 15th of August, 2017, seen from the perspective of the Virgo experiment
by Dr. Nicolas Arnaud (Laboratoire de l'Accelerateur Lineaire CNRS/IN2P3 & Université Paris-Sud, Virgo Experiment)
at SMI - Boltzmanngasse 3, 1090 Wien ( 3-2-08 - Seminarraum )
by Dr. Nicolas Arnaud
Following a multi-year upgrade program and an intense phase of commissioning, the Advanced Virgo detector joined the two twin Advanced LIGO detectors on August 1st, 2017. During the four weeks of common data taking for the global three-detector network, promising gravitational-wave candidates were identified. Among which two discoveries which have been published last Fall: GW170814, another stellar mass binary black hole coalescence and the first signal ever seen by three gravitational-wave detectors; three days later GW170817, the first binary neutron star coalescence detected. Thanks to the accuracy of the 3D-localization of the GW170817 source by the LIGO-Virgo network, the optical counterpart of the merger was identified only about 11 hours after the gravitational-wave signal had been recorded. And its evolution could then be observed for weeks, over multiple wavelengths by tens of telescopes worldwide.