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The main goal of the campaign is to study the flux and spectral evolution of the broad-band emission, from radio to multi-TeV.This multi-frquency data set will allow us to understand better the underlying physics in Mrk421, as well as in High frequency peaked BL Lacs in general.
The most important part of the campaign will be between Mid-December 2009 to Mid-June 2010; this is the time interval with good visibility for optical/TeV instruments. The goal for this time interval is to sample DAILY the peaks of the 2 bumps in the SED of Mrk421 (optical/X-ray and GeV/TeV)
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