  Neutrinos produced in gamma-ray bursters (GRBers) may provide a unique probe
for the physics of these extreme astrophysical systems. Here we discuss
neutrino production in inelastic neutron-proton collisions within the
relativistic outflows associated with GRBers. We consider both the widely used
fireball model and a recently proposed magneto-hydrodynamic (MHD) model for the
GRB outflow.
