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We present observations of the gamma-ray blazar Markarian 501 between April17 and May 5, 2009, with the Whipple 10-m telescope, VERITAS, the Fermi LargeArea Telescope (LAT), Swift and RXTE as part of a 4.5-month multi-wavelengthcampaign. The presentation will focus on the strong very high energy (VHE)gamma-ray activity detected on May 1st with Whipple and VERITAS, when themeasured flux (E > 400 GeV) reached five times the flux of the Crab Nebula,coincident with an increase in the optical polarization by a factor of 5, and arotation of the polarization angle by 15 degrees. We also show that, duringthis 3-week period, the largest flux and spectral variability is seen at thehighest energies of the broadband spectral energy distribution.

Detailed Multifrequency Study of a Rapid VHE Flare of Mrk501 in May 2009