Dynamical ejecta synchrotron emission as possible contributor to the changing behaviour of GRB170817A

Understand

Over the past three years, the fading non-thermal emission from the GW170817 remained generally consistent with the afterglow powered by synchrotron radiation produced by the interaction of the structured jet with the ambient medium.

• Recent observations by Hajela et al.
• (2021) indicate the change in temporal and spectral behaviour in the X-ray band.
• We show that the new observations are compatible with the emergence of a new component due to non-thermal emission from the fast tail of the dynamical ejecta of ab-initio binary neutron star (BNS) merger simulations.