Delayed Afterglow Onset Interpreted as Baryon-Poor Viewing Angle
arXiv:astro-ph/0503533 · doi:10.1086/431792
Abstract
We have suggested previously that baryons in GRB fireballs infiltrate from the surrounding walls that collimate the fireball. The efficiency $ε_b$ for generating blast energy can then be angle dependent. Delayed onset of afterglow can be interpreted as being due to a baryon-poor viewing angle.
Submitted to ApJ Letters February 24, 2005