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Refreshed Shocks and Afterglow Longevity in GRB

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arxiv astro-ph/9712252 v1 pith:QDUELWHH submitted 1997-12-18 astro-ph

M.J. Rees (1) & P. Meszaros (2) ((1) Inst. of Astronomy , Cambridge University (2) Pennsylvania State University) This is my paper · ORCID
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keywords afterglowejectaenergyevenfireballmodelsrangeshock
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abstract

We consider fireball models where the ejecta have a range of bulk Lorentz factors, so that the inner (lower $\Gamma$) parts may carry most of the mass, or even most of the energy. The outer shock and contact discontinuity decelerate as the fireball sweeps up external matter. This deceleration allows slower ejecta to catch up, replenishing and reenergizing the reverse shock and boosting the momentum in the blast wave. In consequence, the energy available to power the afterglow may substantially exceed that of the burst itself. Such models allow a wide range of possibilities for the afterglow evolution, even in the case of spherically symmetric expansion.

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Forward citations

Cited by 4 Pith papers

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  4. GRB 250424A: A Case Study of Energy Injection with Multiwavelength Observations

    astro-ph.HE 2026-06 unverdicted novelty 2.0 of 10

    GRB 250424A afterglow shows simultaneous shallow decay in X-ray and optical bands modeled as continuous energy injection (q≈0.34) into a forward shock in constant-density medium, with E_K,iso ≈5.5×10^52 erg and no cle...

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