We report on VERITAS observations of the BL Lac object B2 1215+30 between 2008 and 2012 .
During this period , the source was detected at very high energies ( VHE ; E > 100 GeV ) by VERITAS with a significance of 8.9 \sigma and showed clear variability on time scales larger than months .
In 2011 , the source was found to be in a relatively bright state and a power-law fit to the differential photon spectrum yields a spectral index of 3.6 \pm 0.4 _ { \mathrm { stat } } \pm 0.3 _ { \mathrm { syst } } with an integral flux above 200 GeV of ( 8.0 \pm 0.9 _ { \mathrm { stat } } \pm 3.2 _ { \mathrm { syst } } ) \times 10 ^ { -12 } \mathrm { cm% } ^ { -2 } \mathrm { s } ^ { -1 } .
No short term variability could be detected during the bright state in 2011 .
Multi-wavelength data were obtained contemporaneous with the VERITAS observations in 2011 and cover optical ( Super-LOTIS , MDM , Swift -UVOT ) , X-ray ( Swift -XRT ) , and gamma-ray ( Fermi -LAT ) frequencies .
These were used to construct the spectral energy distribution ( SED ) of B2 1215+30 .
A one-zone leptonic model is used to model the blazar emission and the results are compared to those of MAGIC from early 2011 and other VERITAS-detected blazars .
The SED can be well reproduced with model parameters typical for VHE-detected BL Lacs .