A doublet of cosmic-ray events with primary energies >1020 eV
Abstract
The Telescope Array Collaboration has observed a cosmic-ray event with estimated primary energy of 1.38*1020 eV whose arrival direction coincides (see arxiv:1205.5984), given the angular resolution of 1.5 deg, with that of an event with estimated primary energy of 1.23*1020 eV observed by the Pierre Auger Observatory. The total number of events with energies >1020 eV published by both experiments is six. I estimate the statistical significance of the doublet, which is rather weak, and point out that the arrival directions of events in the doublet coincide with the Galactic X-ray source Aql X-1.
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