A self-consistent explanation of the MeV line in GRB 221009A unveils a dense circum-stellar medium

O. S. Salafia, A. Celotti, E. Sobacchi +6

GRB~221009A has been the brightest gamma-ray burst (GRB) observed to date, and its afterglow has been characterized with unprecedented detail at TeV energies by LHAASO. Quite puzzl…