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We present our broadband study of GW170817 from radio to hard X-rays,including NuSTAR and Chandra observations up to 165 days after the merger, anda multi-messenger analysis including LIGO constraints. The data are comparedwith predictions from a wide range of models, providing the first detailedcomparison between non-trivial cocoon and jet models. Homogeneous and power-lawshaped jets, as well as simple cocoon models are ruled out by the data, whileboth a Gaussian shaped jet and a cocoon with energy injection can describe thecurrent dataset for a reasonable range of physical parameters, consistent withthe typical values derived from short GRB afterglows. We propose that thesemodels can be unambiguously discriminated by future observations measuring thepost-peak behaviour, with slope -1.0 for the cocoon and -2.5 for the jet model.

The outflow structure of GW170817 from late time broadband observations