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Ultra-high energy cosmic rays (UHECRs) beyond the Greisen-Zatsepin-Kuzmin(GZK) cut-off provide us with a unique opportunity to understand the universeat extreme energies. Secondary GZK photons and GZK neutrinos associated withthe same interaction are indeed interconnected and render access tomulti-messenger analysis of UHECRs. The GZK photon flux is heavily attenuateddue to the interaction with Cosmic Microwave Background (CMB) and theExtra-galactic Radio Background (ERB). The present estimate of the ERBcomprising of several model uncertainties together with the ARCADE2 radioresults in large propagation uncertainties in the GZK photon flux. On the otherhand, the weakly interacting GZK neutrino flux is unaffected by thesepropagation effects. In this work, we make an updated estimate of the GZKphoton and GZK neutrino fluxes considering a wide variation of both theproduction and propagation properties of the UHECR like, the spectral index,the cut-off energy of the primary spectrum, the distribution of sources and theuncertainties in the ERB estimation. We explore the detection prospects of theGZK fluxes with various present and upcoming UHECR and UHE neutrino detectorssuch as Auger, TA, GRAND, ANITA, ARA, IceCube and IceCube-Gen2. The predictedfluxes are found to be beyond the reach of the current detectors. In future,proposed IceCube-Gen2, Auger upgrade and GRAND experiments will have thesensitivity to the predicted GZK photon and GZK neutrino fluxes. Such detectioncan put constraints on the UHECR source properties and the propagation effectsdue to the ERB. We also propose an indirect limit on the GZK photon flux usingthe neutrino-photon connection for any future detection of GZK neutrinos by theIceCube-Gen2 detector. We find this limit to be consistent with our GZK fluxpredictions.

A relook at the GZK Neutrino-Photon Connection: Impact of Extra-galactic Radio Background & UHECR properties