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A puzzling γ-ray burst

The population of γ-ray bursts is sometimes enriched by perplexing events that challenge established theoretical models. Two teams get to grips with understanding one such event — the 'Christmas' burst. See Letters p.69 & p.72

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Correspondence to Enrico Costa.

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Costa, E. A puzzling γ-ray burst. Nature 480, 47–48 (2011).

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