GeV Emission from Collisional Magnetized Gamma Ray Bursts

Understand

Magnetic fields may play a dominant role in gamma-ray bursts, and recent observations by the Fermi satellite indicate that GeV radiation, when detected, arrives delayed by seconds from the onset of the MeV component.

• Motivated by this, we discuss a magnetically dominated jet model where both magnetic dissipation and nuclear collisions are important.
• We show that, for parameters typical of the observed bursts, such a model involving a realistic jet structure can reproduce the general features of the MeV and a separate GeV radiation component, including the time delay between the two.
• The model also predicts a multi-GeV neutrino component.