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The HAWC gamma ray observatory is located at the Sierra Negra Volcano inPuebla, Mexico, at an altitude of 4,100 meters. HAWC is a wide field of viewarray of 300 water Cherenkov detectors that are continuously surveying ~ 2sr ofthe sky, operating since March 2015. The large collected data sample allowsHAWC to perform an unbiased monitoring of the BL Lac Mrk 421. This is theclosest and brightest known extragalactic high-synchrotron-peaked BL Lac in thegamma-ray/X- ray bands and is extensively monitored by the Large Area Telescope(LAT) on-board the Fermi satellite, and the BAT and XRT instruments of theSwift satellite. In this work, we use 25 months of HAWC data together withSwift-XRT data to characterize potential correlations between both wavelengths.This analysis shows that HAWC and Swift-XRT data are correlated even strongerthan expected for quasi-simultaneous observations.

X-ray/gamma-ray flux correlations in the BL Lacs Mrk 421 and 501 using HAWC data