Extreme Energy Cosmic Ray particles (EECR) withE>1020 eVarriving on Earth with very low flux (∼1 particle/Km2-1000yr) require for their investigation very large detecting areas, exceeding values of 1000 km2 sr. Projects with these dimensions are now being proposed: Ground Arrays (“Auger” with2×3500 km2 sr) or exploiting the Earth Atmosphere as seen from space (“AIR WATCH” and OWL,” with effective area reaching 1 million km2 sr). In this last case, by using as a target the1013tons of air viewed, also the high energy neutrino flux can be investigated conveniently. Gamma Rays Bursts are suggested as a possible source for EECR and the associated High Energy neutrino flux. ©1998 American Institute of Physics.