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The Gamma-Ray Burst Rate At High Photon Energies, Karl Mannheim, Dieter H. Hartmann, Burkhardt Funk
The Gamma-Ray Burst Rate At High Photon Energies, Karl Mannheim, Dieter H. Hartmann, Burkhardt Funk
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Some gamma-ray burst (GRB) spectra exhibit high energy tails with the highest photon energy detected at 18 GeV. The spectral slope of the high-energy tails is suffieniently flat in vF, to consider the possibility of their dectection at still higher energies. We calculate how many bursts can resonably be expected above a given energy threshold for a cosmological distribution of bursts satisfying the observed apparent birghtness distribution. The crucial point is that the gamma-ray absorption by pair production in the intergalactic diffuse radiation field climinates burts from beyond the gamma-ray horizion, thus drastically reducing the number of bursts at high …