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Very high energy outburst of Markarian 501 in May 2009
Astronomy and Astrophysics
The very high energy (VHE; E > 100 GeV) blazar Markarian 501 was observed between April 17 and May 5 (MJD 54938--54956), 2009, as part of an extensive multi-wavelength campaign from radio to VHE. Strong VHE γ-ray activity was detected on May 1st with Whipple and VERITAS, when the flux (E > 400 GeV) increased to 10 times the pre-flare baseline flux (3.9× 10^-11 ph cm^-2 s^-1), reaching five times the flux of the Crab Nebula. This coincided with a decrease in the optical polarization and adoi:10.1051/0004-6361/201628744 fatcat:bia3kkrf2rg5pcyylefxccramy