Correlation function of ultrahigh-energy cosmic rays favors point sources

We calculate the angular two-point correlation function of ultrahigh-energy cosmic rays (UHECR) observed in the AGASA and Yakutsk experiments. In both data sets, there is a strong signal at the highest energies, which is conc entrated in the first bin of size equal to the angular resolution of the ex periment. For the uniform distribution of sources, the probability of chanc e clustering is 4 x 10(-6). Correlations are absent or insignificant at lar ger angles. This favors the models with compact sources of UHECR. (C) 2001 MAIK "Nauka/Interperiodica".