Gamma ray sources observed with ARGO-YBJ

Abstract The air shower detector ARGO-YBJ is continuously monitoring the gamma ray sky in the declination band from − 10 ° to + 70 ° at energies E > 0.5 TeV . After ∼4 years of operation, the integrated sensitivity reached the level of ∼ 28 % the Crab Nebula flux. In this work we present a summary of our observations concerning the Crab Nebula, the Cygnus region, the galactic source MGRO J1908+06, and the blazars Mrk421 and Mrk501.