Fig. 2
Top panel: monthly aperture photometry light curve for the 0.1−100 GeV band from 2008 Aug. 04 to 2012 Dec. 14. The dashed line represents the background level. Central panel: weekly maximum likelihood light curve in the 0.1–100 GeV band, from 2011 Feb. 01 to 2012 Dec. 14. Downward triangles represent upper limits. Bottom panel: time evolution of the photon index; solid lines represent the mean value over the entire interval (black line) and during the flare (red line).
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