Paper:	Fireballs with a Neutron Component
Volume:	312, Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era
Page:	389
Authors:	Beloborodov, A.M.
Abstract:	Standard GRB fireballs must carry free neutrons. This crucially changes the mechanism of fireball deceleration by an external medium. As the ion fireball decelerates, the coasting neutrons form a leading front. The gradually decay, leaving behind a relativistic trail of decay products mixed with the ambient medium. The ion fireball sweeps up the trail and drives a shock wave in it. Thus, observed afterglow emission is produced in the neutron trail. The impact of neutrons turns off at ~ 1017 cm from the explosion center, and her a spectral transition is expected in GRB afterglows. Absences of neutron signatures would point to absence of baryons and a dominant Poynting flux in the fireballs.

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