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Variability in GRBs - A Clue
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Variability in GRBs - A Clue
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We show that external shocks cannot produce a variable GRB, unless they are produced by an extremely narrow jets (angular opening of < ~10^{-4}) or if only a small fraction of the shell emits the radiation and the process is very inefficient. Internal shocks can produce the observed complex temporal structure provided that the source itself is variable. In this case, the observed temporal structure reflects the activity of the ``inner engine'' that drives the bursts. This sets direct constraints on it.
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Cited by 1 Pith paper
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The ultra-fast afterglow of GRB 260226A
The bolometric 10 keV-1 GeV afterglow of GRB 260226A decays as t^-1.5 then steepens to t^-2.8, requiring external inverse Compton emission from a pair-loaded wind rather than standard synchrotron.
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