Multi-Messenger emission in Gamma-Ray Bursts

Due to the large amounts of energy they release, the extremely luminous transients called Gamma-Ray Bursts (GRBs) are of great interest for high energy astroparticle physics. In the fireball internal shock scenario, particle acceleration occurs in collisions between regions of the jet with different Lorentz factors. Usually, the observed prompt emission is attributed to synchrotron emission from accelerated electrons. However, if cosmic rays (baryons and nuclei of high energies) are contained in the outflow, they will be co-accelerated with electrons and might produce signatures in the electromagnetic spectrum. Besides, their interactions with the present photon fields will lead to the production of secondary neutrinos. In this talk, I discuss the production of multiple astrophysical messengers within the internal shock scenario, focussing on the constraints on cosmic ray production that come from neutrino and gamma-ray observations.