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Paper: The June 2008 Flare of Markarian 421 from Optical to TeV Energies
Volume: 427, Accretion and Ejection in AGN: a Global View
Page: 295
Authors: Donnarumma, I.; Vercellone, S.; Grube, J.; Raiteri, C. M.; Villata, M.; Wagner, R. M; VERITAS collaboration; GASP-WEBT team; MAGIC collaboration
Abstract: We present optical, X-ray, high-energy (HE) and very-high energy (VHE) gamma-ray observations of the HBL blazar Mrk 421 taken between May 24-June 23 2008. A HE gamma-ray signal was detected by AGILE-GRID in June 9-15, brighter than the EGRET average flux by a factor of 1.5. In hard X-rays (20-60 keV), SuperAGILE resolved a 5-day flare with a maximum flux of ∼55 mCrab. SuperAGILE, RXTE/ASM and Swift/BAT data show a correlated flaring structure between soft and hard X-rays. Hints of the same flaring behavior is also detected in the simultaneous optical data. Swift/XRT revealed on June 12-13 the highest 2-10 keV flux ever observed (>100 mCrab). Observations at VHE (E>200 GeV) gamma-rays with MAGIC and VERITAS in the period June 6-8 show the source flux peaking in a bright state, well correlated with the simultaneous peak in the X-rays. We argue that the gamma-ray flare can be interpreted within the framework of the SSC model in terms of a rapid acceleration of leptons in the jet.
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