The awakening of BL Lacertae: observations by Fermi, Swift and the GASP-WEBT
Since the launch of the Fermi satellite, BL Lacertae has been moderately active at γ-rays and optical frequencies until 2011 May, when the source started a series of strong flares. The exceptional optical sampling achieved by the GLAST-AGILE Support Program of the Whole Earth Blazar Telescope in collaboration with the Steward Observatory allows us
Raiteri, C. M. et al.
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2013