4.5 years multi-wavelength observations of Mrk 421 during the ARGO-YBJ and Fermi common operation time

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We report on the extensive multi-wavelength observations of the blazar Markarian 421 (Mrk 421) covering radio to gamma-rays, during the 4.5 year period of ARGO-YBJ and Fermi common operation time, from August 2008 to February 2013.

• In particular, thanks to the ARGO-YBJ and Fermi data, the whole energy range from 100 MeV to 10 TeV is covered without any gap.
• In the observation period, Mrk 421 showed both low and high activity states at all wavebands.
• The correlations among flux variations in different wavebands were analyzed.