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The Telescope Array Collaboration has observed a cosmic-ray event withestimated primary energy of 1.38*10^20 eV whose arrival direction coincides(see arxiv:1205.5984), given the angular resolution of 1.5 deg, with that of anevent with estimated primary energy of 1.23*10^20 eV observed by the PierreAuger Observatory. The total number of events with energies >10^20 eV publishedby both experiments is six. I estimate the statistical significance of thedoublet, which is rather weak, and point out that the arrival directions ofevents in the doublet coincide with the Galactic X-ray source Aql X-1.

A doublet of cosmic-ray events with primary energies >10^20 eV