Spectral analysis and variability of blazar 1ES 1218+304 with the Fermi Large Area Telescope

The high-synchrotron-peaked BL Lac 1ES 1218+304 belongs to the group of blazars that exhibit a hard gamma-ray spectrum in the energy band from MeV/GeV to TeV. The Large Area Telescope (LAT) on board the Fermi-LAT satellite provides high-energy observations of the blazars in this energy range and is continuously monitoring the gamma-ray emission from 1ES 1218+304, reporting this source as one of hardest spectrum blazars above 0.1 GeV in the latest catalogs. In this work, 12 years of Fermi-LAT observations of 1ES 1218+304 have been analyzed in the energy range 5-300 GeV, beyond the expected spectral peak. We perform a maximum likelihood spectral analysis in order to determine the flux and spectral index of the source, for different emission states (low, medium, high). The results have been compared with VHE gamma-ray observations of the VERITAS and MAGIC telescopes to evaluate the very high-energy spectral behaviour.