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We report the detection of a new TeV gamma-ray source, VER J0521+211, basedon observations made with the VERITAS imaging atmospheric Cherenkov telescopearray. These observations were motivated by the discovery of a cluster of>30GeV photons in the first year of Fermi-LAT observations. VER J0521+211 isrelatively bright at TeV energies, with a mean photon flux of 1.93 +/-0.13_stat +/- 0.78_sys 10^-11 cm-2 s-1 above 0.2 TeV during the period of theVERITAS observations. The source is strongly variable on a daily timescaleacross all wavebands, from optical to TeV, with a peak flux corresponding to~0.3 times the steady Crab Nebula flux at TeV energies. Follow-up observationsin the optical and X-ray bands classify the newly-discovered TeV source as a BLLac-type blazar with uncertain redshift, although recent measurements suggestz=0.108. VER J0521+211 exhibits all the defining properties of blazars inradio, optical, X-ray, and gamma-ray wavelengths.

Discovery of a new TeV gamma-ray source: VER J0521+211