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The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory surveys thevery high energy sky in the 300 GeV to $>100$ TeV energy range. HAWC hasdetected two blazars above $11\sigma$, Markarian 421 (Mrk 421) and Markarian501 (Mrk 501). The observations are comprised of data taken in the periodbetween June 2015 and July 2018, resulting in a $\sim 1038$ days of exposure.In this work we report the time-averaged spectral analysis for both sourcesabove 0.5 TeV. Taking into account the flux attenuation due to theextragalactic background light (EBL), the intrinsic spectrum of Mrk 421 isdescribed by a power law with an exponential energy cut-off with index$\alpha=2.26\pm(0.12)_{stat}(_{-0.2}^{+0.17})_{sys}$ and energy cut-off$E_c=5.1\pm(1.6)_{stat}(_{-2.5}^{+1.4})_{sys}$ TeV, while the intrinsicspectrum of Mrk 501 is better described by a simple power law with index$\alpha=2.61\pm(0.11)_{stat}(_{-0.07}^{+0.01})_{sys}$. The maximum energies atwhich the Mrk 421 and Mrk 501 signals are detected are 9 and 12 TeV,respectively. This makes these some of the highest energy detections to datefor spectra averaged over years-long timescales. Since the observation of gammaradiation from blazars provides information about the physical processes thattake place in their relativistic jets, it is important to study the broad-bandspectral energy distribution (SED) of these objects. To this purpose,contemporaneous data in the gamma-ray band to X-ray range, and literature datain the radio to UV range, were used to build time-averaged SEDs that weremodeled within a synchrotron self-Compton leptonic scenario.

Long-term spectra of the blazars Mrk 421 and Mrk 501 at TeV energies seen by HAWC