ESO Headquarters, Garching, Germany, 31 January–1 February 2018
Understanding the nature and results of black hole and neutron star mergers has become a hot topic in astrophysics. The combination of gravitational wave and electromagnetic observations of GW170817/GRB 170817A have triggered new and interesting science projects. In particular, these observations involved more than 50 observatories and highlight the importance of coordination between different instruments and facilities. The timeline for observations of gravitational wave events spans from seconds to days and coordinated observations of any electromagnetic radiation is critical to obtain relevant information.