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We study the non-thermal jet emission of the BL Lac object B3 2247+381 duringa high optical state. The MAGIC telescopes observed the source during 13 nightsbetween September 30th and October 30th 2010, collecting a total of 14.2 hoursof good quality very high energy (VHE) $\gamma$-ray data. Simultaneousmultiwavelength data was obtained with X-ray observations by the Swiftsatellite and optical R-band observations at the KVA-telescope. We also usehigh energy $\gamma$-ray (HE, 0.1 GeV-100 GeV) data from the Fermi satellite.The BL Lac object B3 2247+381 (z=0.119) was detected, for the first time, atVHE $\gamma$-rays at a statistical significance of 5.6 $\sigma$. A soft VHEspectrum with a photon index of -3.2 $\pm$ 0.6 was determined. No significantshort term flux variations were found. We model the spectral energydistribution using a one-zone SSC-model, which can successfully describe ourdata.

Discovery of VHE gamma-ray emission from the BL Lac object B3 2247+381 with the MAGIC telescopes