Multimessenger astrophysics is the framework for studying the Universe through the synergistic use of electromagnetic radiation, cosmic rays, neutrinos, and gravitational waves. By integrating these diverse channels, researchers can obtain a comprehensive view of violent and energetic astrophysical systems, such as compact object mergers, active galactic nuclei, and cosmic accelerators. It is now one of the fastest-evolving fields in astronomy, with new discoveries occurring every year and many more expected in the coming years, thanks to the opening of new observational regimes with future missions like LISA or NewAthena.

This summer school in Multimessenger Astrophysics will cover both foundational theory and data-driven methods that are shaping current and future research directions in high-energy astrophysics and relativity. It will cover the most essential topics through lectures and hands-on sessions led by experts from the Gravitational Waves Group and the Multimessenger Astrophysics Group at ICE-CSIC, as well as by external researchers.

It will be divided into 5 units complemented with special courses and hands-on sessions: 

Unit 1: Radiation processes and basic processes

Acceleration processes, radiation by an accelerated charge, high energy astrophysical radiation, synchrotron, inverse Compton, curvature and synchro-curvature processes, hadronic interactions. 

Unit 2: Cosmic ray astrophysics: 

Generation and measurement of the cosmic ray spectrum, ultra-high energy cosmic rays, propagation, diffusion, absorption, Galactic cosmic rays, Extragalactic cosmic rays and the GZK cutoff, cosmic rays and star-formation regions. Cosmic ray experiments from ground and space

Unit 3: Gamma-ray astrophysics: 

Gamma-ray background. Issues at different energies from MeV to GeV and the kind of detectors needed for each. Gamma-ray populations. Difference in reach and techniques in GeV and TeV astronomy.

Unit 4: Neutrino astrophysics: 

Basics of neutrino physics. Neutrino oscillations. Propagation effects. Measurement techniques. Solar and astrophysical neutrinos, difference in physics, detection methods, and energies. Experiments on ice and water. 

Unit 5: Gravitational wave astrophysics:  

Basic theoretical background. Wave propagation and emission, basic physics of compact objects as sources of gravitational waves. Interferometric experiments from ground and space. Matched filtering vs. waveform agnostic data analysis methods. Waveform phenomenology and modelling. Extracting astrophysical parameters.