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The arrival directions of ultra-high-energy cosmic rays appear to beapproximately isotropically distributed over the whole sky, but thelast-generation UHECR detector arrays, the Pierre Auger Observatory (Auger) andthe Telescope Array (TA), have detected thousands of events, allowing us tostudy small deviations from isotropy. So far, Auger has detected a large-scaleanisotropy consistent with a $\sim 6.5\%$ dipole moment in the distribution ofcosmic rays with $E > 8$~EeV, and both collaborations have reported indicationsfor smaller-scale anisotropies at higher energies. On the other hand, neitherarray has full-sky coverage, the Auger field of view being limited todeclinations $\delta < +45^\circ$ and the TA one to $\delta > -16^\circ$.Searches for anisotropies with full-sky coverage thus require combining datafrom both arrays. A working group with members from both collaborations hasbeen established for this task. Since even a minor systematic error in theenergy determinations at either of the arrays could result in a sizeablespurious anisotropy along the north--south axis, we devised a method tocross-calibrate the energy scales of the two experiments with respect to eachother by using events in a declination band within the intersection of theirfields of view. In this contribution, we report on both updates on blindsearches for anisotropies and the first full-sky studies of flux models basedon possible local extragalactic sources.

Full-sky searches for anisotropies in UHECR arrival directions with the Pierre Auger Observatory and the Telescope Array