High-energy gamma-ray astronomy in the multimessenger era

The past few years have been essential for multimessenger astrophysics, with the first detection of gravitational waves from the merging of two neutron stars and the recent announcement of a high-energy neutrino event detected by IceCube coincident in direction and time with a gamma-ray flare from a blazar detected by the Fermi gamma-ray satellite. Gravitational Wave and Neutrino sources and their electromagnetic counterparts, together with new developments in transient astronomy, are an active field where the nature of many phenomena is still unknown or debated. Furthermore, the generation of new sensitive, wide-field instrumentation across the entire electromagnetic and astroparticle spectrum (SKA, CTA, KM3NeT, ELT, Athena) is set to radically change the way we perceive the Universe. In the next decade, space and ground-based detectors will jointly explore the Universe through all its messengers. © 2019 Jagellonian University. All rights reserved.