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The distribution of ultra-high-energy cosmic-ray arrival directions appearsto be nearly isotropic except for a dipole moment of order $6 \times(E/10~\mathrm{EeV})$ per cent. Nonetheless, at the highest energies, as thenumber of possible candidate sources within the propagation horizon and themagnetic deflections both shrink, smaller-scale anisotropies might be expectedto emerge. On the other hand, the flux suppression reduces the statisticsavailable for searching for such anisotropies. In this work, we consider twodifferent lists of candidate sources: a sample of nearby starburst galaxies andthe 2MRS catalog tracing stellar mass within $250~\mathrm{Mpc}$. We combinesurface-detector data collected at the Pierre Auger Observatory until 2020 andthe Telescope Array until 2019, and use them to test models in which UHECRscomprise an isotropic background and a foreground originating from thecandidate sources and randomly deflected by magnetic fields. The freeparameters of these models are the energy threshold, the signal fraction, andthe search angular scale. We find a correlation between the arrival directionsof $11.8\%_{-3.1\%}^{+5.0\%}$ of cosmic rays detected with $E \ge38~\mathrm{EeV}$ by Auger or with $E \gtrsim 49~\mathrm{EeV}$ by TA and theposition of nearby starburst galaxies on a${15.5^\circ}_{-3.2^\circ}^{+5.3^\circ}$ angular scale, with a $4.2\sigma$post-trial significance, as well as a weaker correlation with the overallgalaxy distribution.

UHECR arrival directions in the latest data from the original Auger and TA surface detectors and nearby galaxies