Challenges for the Electromagnetic follow-up of transient Gravitational Wave

The strongest gravitational waves in the universe are attributed to violent
events such as the mergers of neutron star or black hole binaries. Decades of
theoretical and experimental efforts are about to culminate with the first
direct detection of gravitational waves. The resulting measurements will offer
us an unprecedented view of strong-field gravity in action. I will discuss
ongoing efforts aimed at preparing multi-wavelength follow-up studies of
potentially upcoming gravitational wave events. Such follow-up using optical,
gamma-ray and radio surveys and telescopes are critical for improving our
understanding of the strong-field gravity astrophysical processes. As an
illustration, I will outline the challenges that lie ahead in pinpointing the
sky location of neutron star binary mergers using worldwide networks of
gravitational-wave interferometers and electromagnetic synoptic wide-field