The transient high-energy sky
|Date||23 September 2020|
The last years have brought about unprecedented breakthroughs and discoveries in high energy astrophysics. Most of them are related to transient phenomena and involve an increasing number of cosmic messengers ranging now from radiation across the full electromagnetic spectrum, to high-energy neutrino and gravitational waves. Due to their high sensitivity and increasingly optimized response to transient phenomena, high-energy gamma ray observatories are playing a major role in this new field of time-domain and multi messenger astrophysics at the highest energies.
In this colloquium I will review some of the recent highlights involving transient multi messenger phenomena with a focus on studies using Imaging Atmospheric Cherenkov Telescopes. I will present current state-of-the-art target-of-opportunity observations searching for high-energy gamma-ray emission from a variety of sources including gamma-ray bursts, gravitational waves and high-energy neutrinos.