[@Lat09]. The instrument has been designed to measure the directions, energies and arrival times of incident photons in the energy range 20 MeV to $>$ 300 GeV while rejecting the background from cosmic rays. In its nominal scanning mode, it surveys the whole sky every 3 h with a large field of view of about 2.4 steradian. The *Fermi*-LAT data for 1ES 1218+304 were retrieved from the publicly available NASA data base[^1] during the period March 1, 2013 to April 15, 2013 (MJD 56352–56397). We selected the good quality events from the “source class” over the energy range 100 MeV–100 GeV and the events were extracted from a circular region of interest (ROI) with radius $15^{\circ}$ centered at the source position (RA=$12^h 21^m 23.5^s$, Dec=$30^{\circ} 10^{\prime} 43.2^{\prime\prime}$). In addition, we excluded the events observed with zenith angles $>$ 100$^{\circ}$ to limit contamination from Earth limb $\gamma$–rays, and events detected while the spacecraft rocking angle was $>$ 52$^{\circ}$ to avoid time intervals during which the bright limb of the Earth entered the LAT field of view.

The data obtained in this manner were analyzed using the standard *Fermi* Science-Tools software package (version v9r27p1). We used P7$\_$SOURCE$\_$V6 instrument response function with the 