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We report the serendipitous discovery of transient, point-like high energygamma-ray emission coincident with the position of the suspected BL Lac object5C 3.178. The source was detected using the Fermi Large Area Telescope (LAT) ata significance level of ~8 sigma during a 200 day period which began on MJD55882. The observed gamma-ray emission is characterised by a moderate 0.2-300GeV flux F(0.2-300 GeV)=$(8.22\pm2.04)\times10^{-9}$ ph cm$^{-2}$s$^{-1}$ and ahard power law spectrum with spectral index $\Gamma=1.76\pm0.09$. Theseproperties appear consistent with the known sub-population of TeVgamma-ray-emitting BL Lac objects, implying that the source may be detectableusing atmospheric Cherenkov telescope arrays. Moreover, the temporalvariability of the source suggests that real-time searches of the Fermi-LATall-sky dataset for weak emission on ~200 day timescales may represent arewarding strategy.

Discovery of transient high-energy gamma-ray emission from the BL Lacertae object 5C 3.178