The emergence of diffused gamma-ray burst afterglows from the discs of active galactic nuclei

ABSTRACT The discs of active galactic nuclei (AGNs) have emerged as rich environments for the production and capture stars compact objects that they leave behind. These produce long gamma-ray bursts (GRBs) at their deaths, while frequent interactions among form binary neutron star–black hole binaries, leading to short GRBs upon merger. Predicting properties these transients emerge from dense AGN is key proper identification better constrain star object population in discs. Some would appear unusual because take place much higher densities than interstellar medium. Others, which are subject this paper, additionally be modified by radiation diffusion, since generated within optically thick regions accretion Here, we compute GRB afterglow light curves diffused sources a representative variety central black masses disc locations. We find radio ultraviolet soft X-rays can strongly suppressed synchrotron self-absorption medium disc. In addition, photon diffusion significantly delay emergence emission peak, turning beamed, fast transient into slow, isotropic, dimmer one. broad-band correlated variability with dominance frequencies. Their both stellar populations structure.