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B2 1215+30 is a BL Lac-type blazar that was first detected at TeV energies bythe MAGIC atmospheric Cherenkov telescopes, and subsequently confirmed by theVERITAS observatory with data collected between 2009 and 2012. In 2014 February08, VERITAS detected a large-amplitude flare from B2 1215+30 during routinemonitoring observations of the blazar 1ES 1218+304, located in the same fieldof view. The TeV flux reached 2.4 times the Crab Nebula flux with a variabilitytimescale of < 3.6 h. Multiwavelength observations with Fermi-LAT, Swift, andthe Tuorla observatory revealed a correlated high GeV flux state and nosignificant optical counterpart to the flare, with a spectral energydistribution where the gamma-ray luminosity exceeds the synchrotron luminosity.When interpreted in the framework of a one-zone leptonic model, the observedemission implies a high degree of beaming, with Doppler factor > 10, and anelectron population with spectral index < 2.3.

A luminous and isolated gamma-ray flare from the blazar B2 1215+30