
TL;DR
This review discusses the theoretical models of long-duration gamma-ray burst central engines, comparing collapsar and proto-magnetar models based on key physical requirements and observational features.
Contribution
It provides a comparative analysis of collapsar and proto-magnetar models, highlighting the proto-magnetar's ability to produce high Lorentz factors and sustained luminosity.
Findings
Proto-magnetar model can produce Lorentz factor ~100.
Both models must meet angular momentum and duration requirements.
The models explain association with supernovae and flow asymmetry.
Abstract
I review aspects of the theory of long-duration gamma-ray burst (GRB) central engines. I focus on the requirements of any model; these include the angular momentum of the progenitor, the power, Lorentz factor, asymmetry, and duration of the flow, and both the association and the non-association with bright supernovae. I compare and contrast the collapsar and millisecond proto-magnetar models in light of these requirements. The ability of the latter model to produce a flow with Lorentz factor ~100 while simultaneously maintaining a kinetic luminosity of ~10^50 ergs/s for a timescale of ~10-100 s is emphasized.
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