Left-hand panel: GRB 170817A afterglow light curves in radio at 3 GHz and 6 GHz (red and orange stars, respectively, VLA observations – data from Hallinan et al. 2017; Mooley et al. 2018), in the optical (green stars, HST/ACS observations in the F606W filter – data from Lyman et al. 2018 and Margutti et al. 2018) and in the X-rays (blue stars: Chandra observations, data from Margutti et al. 2018; Troja et al. 2018b; light blue circle: our XMM-Newton observation). Thick coloured solid lines represent our isotropic fireball model (corresponding to either the jet-less scenario outlined in Salafia et al. 2017, or the choked jet scenario proposed by Mooley et al. 2018). The brown dashed lines represent our structured jet model. The parameters of both models are reported in Table 1. Upper right-hand panel: the jet structure assumed in our model. The red line represents the isotropic equivalent kinetic energy, while the blue line shows the Lorentz factor. Lower right-hand panel: the red line shows the peak time of the isotropic outflow light curve as a function of the minimum velocity βmin in the velocity profile. The dashed lines mark the value we employed in the modelling.
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