Opacity effects in relativistic sources of high-energy gamma-rays,
such as gamma-ray bursts (GRBs) or Blazars, can probe the Lorentz
factor of the outflow as well as the distance of the emission site
from the source, and thus help constrain the composition of the
outflow (protons, pairs, magnetic field) and the emission
mechanism. The attenuation of high energy photons will be probed by
the
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