Growing evidence suggests that synchrotron radiation plays a significant role in shaping the spectra of most γ-ray bursts. The relativistic jets producing them are likely to carry a significant fraction of energy in the form of a Poynting flux.
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Zhang, B. Synchrotron radiation in γ-ray bursts prompt emission. Nat Astron 4, 210–211 (2020). https://doi.org/10.1038/s41550-020-1041-3
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DOI: https://doi.org/10.1038/s41550-020-1041-3
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