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"GZK photons" are produced by extragalactic nucleons through the resonantphotoproduction of pions. We present the expected range of the GZK photonfraction of UHECR, assuming a particular UHECR spectrum and primary nucleons,and compare it with the minimal photon fraction predicted by Top-Down models.Comment: Talk given at TAUP2005, Sept. 10-14 2005, Zaragoza (Spain); 3 pages,  2 figure

GZK photons as UHECR above 1019eV

GZK photons as UHECR above 10¹⁹eV