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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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