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We performed calculations of the late radio and X-ray afterglow ofGRB/GW170817 in the cocoon-jet paradigm, predicting the appearance of a secondpeak in the afterglow light curve ~ one-three years after the explosion. Themodel assumes that the prompt emission and early afterglows originate from acocoon generated during break-out of the delayed magnetically powered jet. Asthe jet breaks out from the torus-generated wind, a nearly isotropic mildlyrelativistic outflow is generated; at the same time the primary jet acceleratesto high Lorentz factors and avoids detection. As the fast jet slows down, itshould become visible to the off-axis observer. Thus, the model has a clearprediction: the X-ray and radio afterglows should first experience a decay, asthe cocoon slows down, followed by a rebrightening when the primary jet startsemitting toward an observer.

Prediction of the second peak in the afterglow of GW170817