We present the analysis of 2.1 years of Fermi /LAT data on 491 Seyfert galaxies detected by the Swift /BAT survey .
Only the two nearest objects , NGCÂ 1068 and NGCÂ 4945 , which were identified in the Fermi First-year Catalog , are detected .
Using the Swift /BAT and radio 20Â cm fluxes , we define a new radio-loudness parameter R _ { X,BAT } where radio loud objects have \log R _ { X,BAT } > -4.7 .
Based on this parameter , only radio loud sources are detected by Fermi /LAT .
An upper limit to the flux of the undetected sources is derived to be \sim 2 \times 10 ^ { -11 }  photons cm ^ { -2 }  s ^ { -1 } , approximately seven times lower than the observed flux of NGC 1068 .
Assuming a median redshift of 0.031 , this implies an upper limit to the \gamma -ray ( 1–100 GeV ) luminosity of \lesssim 3 \times 10 ^ { 41 }  erg s ^ { -1 } .
In addition , we identified 120 new Fermi /LAT sources near the Swift /BAT Seyferts with significant Fermi /LAT detections .
A majority of these objects do not have Swift /BAT counterparts , but their possible optical counterparts include blazars , FSRQs , and quasars .