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We show that the deep expected in the diffuse photon spectrum above thethreshold of e+e- pair production, i.e., at energies 10^15 - 10^17 eV, may beabsent due to the synchrotron radiation by the electron component of theextragalactic Ultra-High Energy Cosmic Rays (UHE CR) in the Galactic magneticfiled. The mechanism we propose requires small (less than 2x10^-12 G)extragalactic magnetic fields and large fraction of photons in the UHE CR. Fora typical photon flux expected in top-down scenarios of UHE CR, the predictedflux in the region of the deep is close to the existing experimental limit. Thesensitivity of our mechanism to the extragalactic magnetic field may be used toimprove existing bounds on the latter by two orders of magnitude.Comment: 11 pages, LaTeX, 1 .ps figure. Numerical error corrected; references  adde

Generation of 1015–1017 eV photons by ultrahigh-energy cosmic rays in the Galactic magnetic field