Speaker
Description
Recent years have brought a number of breakthroughs and discoveries in high-energy astrophysics. Many of these advances are related to transient phenomena and involve all known cosmic messengers from radiation across the full electromagnetic spectrum to high-energy neutrinos, gravitational waves, and cosmic rays. Due to their high sensitivity and increasingly optimized response to transient events, high-energy gamma-ray observatories play a crucial role in this emerging field of time-domain and multi-messenger astrophysics at the highest energies.
In this presentation, I will review some of the recent highlights involving transient multi-messenger phenomena, with a particular focus on studies utilizing Imaging Atmospheric Cherenkov Telescopes (IACTs). I will discuss the current state-of-the-art target-of-opportunity observations aimed at detecting high-energy gamma-ray emission from various sources and messengers, including gamma-ray bursts (GRBs), gravitational waves, and high-energy neutrinos. These observations have led to significant advances in our understanding of cosmic ray acceleration processes in diverse environments such as novae, microquasars, GRBs, active galactic nuclei, and others. I will provide an overview of these findings and place them in the context of proposed models for ultra-high-energy cosmic ray (UHECR) sources.
