Numerical Simulations of an Initially Top-Hat Jet and the Afterglow of GW170817/GRB170817A

Ramandeep Gill, Jonathan Granot, Fabio De Colle +1

The afterglow of GRB170817A/GW170817 was very unusual, slowly rising as $F_{\nu }\propto t_{\mathrm{obs}}^{0.8}{\nu }^{-0.6}$, peaking at $t_{\mathrm{obs},\mathrm{pk}}\sim 150$days, and sharply d…