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Long and short gamma-ray bursts are traditionally associated with galacticenvironments, where circumburst densities are small or moderate (few tohundreds of protons per cubic cm). However, both are also expected to occur inthe disks of Active Galactic Nuclei, where the ambient medium density can bemuch larger. In this work we study, via semi-analytical methods, thepropagation of the GRB outflow, its interaction with the external material, andthe ensuing prompt radiation. In particular, we focus on the case in which theexternal shock develops early in the evolution, at a radius that is smallerthan the internal shock one. We find that bursts in such high densityenvironments are likely characterized by a single, long emission episode thatis due to the superposition of individual pulses, with a characteristic hard tosoft evolution irrespective of the light curve luminosity. While multi-pulselight curves are not impossible, they would require the central engine to godormant for a long time before re-igniting. In addition, short GRB engineswould produce bursts with prompt duration that would exceed the canonical 2 sseparation threshold and would likely be incorrectly classified as long events,even though they would not be accompanied by a simultaneous supernova. Finally,these events have a large dynamical efficiency which would produce a brightprompt emission followed by a somewhat dim afterglow.

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