Prompt Emission of Gamma-Ray Bursts in the High-density Environment of Active Galactic Nuclei Accretion Disks

Understand

Long and short gamma-ray bursts are traditionally associated with galactic environments, where circumburst densities are small or moderate (few to hundreds of protons per cubic cm).

• However, both are also expected to occur in the disks of Active Galactic Nuclei, where the ambient medium density can be much larger.
• In this work we study, via semi-analytical methods, the propagation of the GRB outflow, its interaction with the external material, and the ensuing prompt radiation.
• In particular, we focus on the case in which the external shock develops early in the evolution, at a radius that is smaller than the internal shock one.