A doublet of cosmic-ray events with primary energies >10^20 eV
arXiv:1205.6435 · doi:10.1134/S0021364012130115
Abstract
The Telescope Array Collaboration has observed a cosmic-ray event with estimated 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 an event with estimated primary energy of 1.23*10^20 eV observed by the Pierre Auger Observatory. The total number of events with energies >10^20 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.
arXiv comment4 pages, 3 figures, submitted to JETP Letters; v.2: a misprint corrected
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