Fig. 2.
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Ultraviolet–optical–infrared spectra of the afterglow emission of GRB 160821B for different times as labeled. The observational data are taken from (Lamb et al. 2019; Troja et al. 2019). The dotted, dash-dotted, dashed, and solid lines correspond to the emissions of the jet external shock, the thermal kilonova, the PWN, and their combination, respectively.
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