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The Fermi/LAT team is organizing a multi-wavelength campaign on the blazar Markarian 421, starting on December 13th, 2017 and finishing in mid May 20172018.
This time interval provides with good visibility for optical/TeV instruments. The goal for this time interval is to sample every 2-3 days the peaks of the 2 components in the SED of Mrk421 (optical/X-ray and GeV/TeV)
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