Prompt TeV Emission from Cosmic Rays Accelerated by Gamma Ray Bursts   Interacting with Surrounding Stellar Wind
  Protons accelerated in the internal shocks of a long duration gamma ray burst can escape the fireball as cosmic rays by converting to neutrons. Hadronic interactions of these neutrons inside a stellar wind bubble created by the progenitor star will produce TeV gamma rays via neutral meson decay and synchrotron radiation by charged pion-decay electrons in the wind magnetic field. Such gamma rays should be observable from nearby gamma ray bursts by currently running and upcoming ground-based detectors. 
Soebur Razzaque, Olga Mena and Charles D. Dermer