Neutrinos and gamma rays from photomeson processes in gamma ray bursts

Acceleration of high-energy hadrons in GRB blast waves will be established if high-energy neutrinos are detected from GRBs. Recent calculations of photomeson neutrino production are reviewed, and new calculations of high-energy neutrinos and the accompanying hadronic cascade radiation are presented. If hadrons are injected in GRB blast waves with an energy corresponding to the measured hard X-ray/soft gamma-ray emission, then only the most powerful bursts at fluence levels greater than or similar to 3 x 10(-4) erg cm(-2) offer a realistic prospect for detection of nu(mu). Detection of high-energy neutrinos are likely if GRB blast waves have large baryon loads and Doppler factors less than or similar to 200. Significant limitations on the hadronic baryon loading and the number of expected neutrinos are imposed by the fluxes from pair-photon cascades initiated in the same processes that produce neutrinos.