Multi-messenger astronomy turned into a reality in the past five years, with the first detection of Gravitational Waves in 2015, the first gravitational and electromagnetic observations of the coalescence of neutron stars in 2017, the first evidence of a common source of neutrinos and energetic photons from a distant galaxy in 2017.
The Fermi telescope, operating as an all-sky monitor for high energy gamma-ray transients, is central to such observational efforts which include a large community of different observatories.
In this seminar I will review the scientific context, the current observational scenario and the future prospects for Fermi and other players of this global endeavor.