New methods to search for Cross-Correlations between UHECR data and BL Lac sources.

The arrival direction study of Ultra High Energy Cosmic Rays gives us potentially an insight on their origin. The High Resolution Fly's Eye (HiRes) is a stereo air fluorescence experiment that detects cosmic rays with energies greater than $\sim $10$^{18}$ eV. The angular resolution of HiRes is approximately 0.6$^{\circ}$. This small uncertainty is well suited for small-scale anisotropy studies. Here we present the correlation of the observed cosmic rays by HiRes with some astronomical sources, in particular with BL Lac sources, which are a subclass of active galaxies.