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A. M. Beloborodov (CITA)
Standard GRB fireballs must carry free neutrons. This crucially changes the mechanism of fireball deceleration by an external medium. The impact of neutrons turns off at ~1017 cm from the explosion center, and here a spectral transition is expected in GRB afterglows. Absence of neutron signatures would point to absence of baryons and a dominant Poynting flux in the fireballs.
Bulletin of the American Astronomical Society,
© 2003. The American Astronomical Soceity.