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Wind-confined jet collimation revealed by the acceleration-phase photosphere of GRB 220426A

Ryde, Felix et al.
arXiv (All) · Papers
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high-energy-astrophysical-phenomena
We analyze the prompt emission of the exceptionally bright GRB 220426A observed by {\it Fermi}/GBM, whose time-resolved spectra are among the narrowest measured in any GRB. Here we show that observations during the first $\sim 5$~s are consistent with the signal being emitted while the jet was still
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