Astrophysics & Particle Physics-APPC 2026

Multi-wavelength transient astronomy targets the observation and study of short-lived, dynamic cosmic events that emit across several parts of the electromagnetic spectrum. The transient events, from milliseconds to months long, are of pivotal importance to understand stellar evolution, extreme astrophysical phenomena, and compact object formation. By observing these events across several wavelengths, astronomers are able to reconstruct the physical conditions, energy processes, and surrounding environments powering the explosions. For instance, gamma-ray and X-ray observations unveil the high-energy physics, optical is tracing material expulsion and death, and radio imaging charts interactions with ambient media.Multi-wavelength transient astronomy is heavily entwined with multi-messenger astronomy, where transients are being matched with gravitational waves or neutrino signals.

This dual strategy allows a total view of such events as neutron-star mergers, both for the explosion dynamics and the compact objects formed.Huge surveys, such as LSST (Vera Rubin Observatory), Swift, Fermi, Pan-STARRS, and ZTF (Zwicky Transient Facility), are essential to discover and follow transient events. Prompt follow-up across wavelengths guarantees coverage of the complete temporal and spectral development of every event. In short, multi-wavelength transient astronomy offers a powerful paradigm for comprehending the universe's most energetic and dynamic phenomena. Through joint observations across the electromagnetic spectrum and with multi-messenger signatures, astronomers reveal the physics of stellar demise, compact object interaction, and explosive cosmic explosions, increasing our understanding of the high-energy universe.