Tau Now

Ultra High Energy Cosmic Rays and UHE neutrinos may lead to a new deep astronomy. However the most recentresults on their correlations and clustering seem to most authors inconclusive. We briefly remind some UHECRmodels and past and recent results. Our reading and overlapping of IR-gamma-UHECR maps and their correlationsseem to answer to several key puzzles, offering a first hope of the UHECR astronomy, mostly ruled by lightest nucleifrom nearby Universe. Regarding the UHE neutrino we recently noted that the flavor ratio and the absence of doublebang in IceCube within highest energetic ten events may suggest still a dominant noisy prompt component. Howevera first correlated UHE crossing muon with expected location (through going upward muon neutrino or horizontally)in IceCube is in our view a milestone in neutrino astronomy road map, possibly partially related, to galactic UHECRnarrow clustering. The disturbing and persistent atmospheric neutrino noises, both conventional and prompt, callfor a better filtered neutrino astronomy: the tau neutrino ones. There are no yet (at present, detectable) TeV-PeVsor more energetic tau neutrino of atmospheric , conventional or prompt nature; only astrophysical ones might soonshine. Double bangs in IceCube and in particular the tau air-showers in large array are the unique definitive expectedsignatures of astrophysical signals. In particular tau air-shower amplify in a huge way the otherwise single leptontrack, once in decay in flight, into a richest three of secondaries (up to a million of billion Cherenkov photons for PeVtau energy) whose wide areas may extend up to nearly kilometer size. Such airshowers are very directional. PeVsenergetic tau lepton penetrate hundreds meters inside the rock before its decay. Therefore horizontal tau air-shower infront of deep, wide valleys or mountain cliff[1], as well as up-going tau air showers escaping our Earth, observable inair by their fluorescence lights as in AUGER and TA, might be a signal at EeVs energies. At lower energies blazingfew PeVs tau airshower flashes are better observable from the top of the mountains, by an array located in a crownedge (as water Cherenkov, telescope Cherenkov or radio array), as it has been done in ASHRA or it might be done onideal modified GRAND experiments constructed within aeolian towers by radio array possibly in mountains, facingthe wide peculiarτneutrino sky: our own Earth