Numerical modelling with analytical estimation of the free parameter space of GRB afterglows: The case of GRB 221009AClaudio Gasbarra, Daniele Belardinelli, Viviana Fafone, Davide Miceli, Aldo Morselli and Gonzalo Rodriguez FernandezEPJ Web Conf., 319 (2025) 08006DOI: https://doi.org/10.1051/epjconf/202531908006