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The Fermi/LAT team is organizing a multi-wavelength campaign on the blazar Markarian 501, starting on April 7th 2013 and finishing on August 10th 15th 2013.
This time interval provides with good visibility for optical/TeV instruments. The goal for this time interval is to sample every few days the peaks of the 2 components in the SED of Mrk501 (optical/X-ray and GeV/TeV)
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