Ultra-high energy gamma-rays, neutrinos, and gravitational waves from GRBs

Most current knowledge about GRBs is based on sub-MeV electromagnetic signals. However, some observations and recent theoretical work indicate that important clues may be gleaned from their GeV-TeV photon spectra. In addition, one expects GRB to be prominent in two other potentially important non-electromagnetic channels, gravitational waves and TeV or higher energy neutrinos. The former is a natural consequence of compact merger or collapse scenarios, while the latter is associated with a hadronic component in the outflow. The information in these channels and prospects for their detection are discussed.