Stereoscopic Observations of the Blazar 3C 66A with the MAGIC Telescopes

Understand

3C 66A is an intermediate-frequency peaked BL Lacertae object of uncertain redshift.

• We report recent observations of the region around the blazar with the MAGIC telescopes.
• The source was observed and detected in 2009 December and 2010 January, in 2.3 h of good quality data.
• The signal could clearly be assigned to the blazar 3C 66A, statistically and systematically rejecting the nearby radio galaxy 3C 66B as a possible origin of the gamma-ray signal by 3.6 standard deviations.