Speaker
Description
The gamma-ray burst GRB 221009A represents an exceptional event due to its intensity, spectral evolution, and duration. We investigate the wide multi-wavelength coverage of this GRB, starting our analysis with the simultaneous MeV-GeV-TeV spectral and intensity data acquired by AGILE and LHAASO. While the coexistence of MeV-GeV data from the AGILE satellite reveals a transition phase from the prompt to the afterglow phase, the GeV-TeV gamma-ray detection provides strong constraints on the modeling of this burst.
We present the results of a relativistic fireball model with a set of physical parameters that satisfactorily explains the first phases of the afterglow up to $10^4$ seconds. Interestingly, an extension of the model to late times up to $10^7$ seconds also describes the late X-ray and optical data in a consistent picture. Our results provide important insights into constraining the physics of particle acceleration and evolution in GRB 221009A and can be extended to the analysis of other powerful GRBs.
