  Recent observations suggest that gamma ray bursts (GRBs) and their afterglows
are produced in star formation regions in distant galaxies by highly
relativistic jets that happen to point in our direction. Relativistic beaming
collimates the emission from the highly relativistic jets into small solid
angles along the jet direction. It implies that we are seeing only a small
fraction of the events that produce GRBs. The observed GRB rate then requires
an event rate which is comparable to the birth rate of neutron stars (NS). The
highly relativistic jets sweep up ambient matter along their trajectories,
accelerate it to cosmic ray (CR) energies and disperse it in hot spots which
they form when they stop in the galactic halo. With an event rate comparable to
the NS birth rate, such events in our Galaxy may be the main source of Galactic
cosmic rays at all energies. Internal interactions and/or external interactions
of these jets with high column density matter and/or radiation at their
production sites or along their trajectories can produce high energy gamma rays
and neutrinos that are highly beamed along the jet direction. Jetted GRBs, like
blazars, may be much more fluent in high energy gamma rays and neutrinos than
in MeV gamma rays. But, TeV gamma rays from large cosmological distances are
unobservable because of their attenuation by electron-positron pair creation on
the intergalactic infrared background radiation. However, high energy neutrinos
from distant GRBs may be observed with large surface/volume telescopes which
are under construction. TeV gamma rays and high energy neutrinos may also be
detected from relatively nearby GRBs by the existing moderate size detectors,
but with a much smaller rate.
