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We report the observation in the GeV band of the blazar 1ES 0229+200, whichover recent years has become one the primary sources used to put constraints onthe Extragalactic Background Light (EBL) and Extragalactic Magnetic Field(EGMF). We derive constraints on both the EBL and EGMF from the combinedFermi-HESS data set taking into account the direct and cascade components ofthe source spectrum. We show that the limit on the EBL depends on the EGMFstrength and vice versa. In particular, an EBL density twice as high as thatderived by Franceschini et al. (2008) is allowed if the EGMF is strong enough.On the other hand, an EGMF strength as low as 6x10^-18 G is allowed if the EBLdensity is at the level of the lower bound from the direct source counts. Wepresent the combined EBL and EGMF limits on as an exclusion plot in twodimensional parameter space: EGMF strength vs. EBL density.

Fermi/LAT observations of 1ES 0229+200: implications for extragalactic magnetic fields and background light