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On The External Shock Synchrotron Model for GRBs' GeV Emission · Around

2010

On The External Shock Synchrotron Model for GRBs' GeV Emission

Piran, Tsvi, Nakar, Ehud

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The dominant component of the (100 MeV - 50 GeV) GRB emission detected by LAT starts with a delay relative to the prompt soft (sub-MeV) gamma-rays and lasts long after the soft component fades.

This has lead to the intriguing suggestion that this high energy emission is generated via synchrotron emission of relativistic electrons accelerated by the external shock.
Moreover, the limits on the MeV afterglow emission lead to the suggestion that, at least in bright GeV bursts the field is not amplified beyond compression in the shock.
We show here that considerations of confinement (within the decelerating shock), efficiency and cooling of the emitting electrons constrain, within this model, the magnetic fields that arise in both the upstream (circum burst) and downstream (ejecta) regions, allowing us to obtain a direct handle on their values.

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Then

Zou, Y., Fan, Y., and Piran, T. 2009, MNRAS, 396, 1163, 0811.2997
Original
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