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The HBL-type blazar Markarian 421 is one of the brightest TeV gamma-raysources of the Northern sky. From December 2007 until June 2008 it wasintensively observed in the VHE (E>100 GeV) band by the MAGIC gamma-raytelescope. The source showed intense and prolonged activity during the wholeperiod. In some nights the integral flux rose up to 3.6 Crab units (E>200 GeV).Intra-night rapid flux variations were observed. We compared the optical (KVA)and X-ray (RXTE-ASM, Swift-XRT) data with the MAGIC VHE data, investigating thecorrelations between different energy bands.

MAGIC observations of Mkn 421 in 2008, and related optical/X-ray/TeV MWL study