Fig. 2

Multiwavelength light curve from February 2011 to June 2011. The MAGIC ToO observation window is marked by vertical lines. Starting from the top panel: HE γ-ray observations from Fermi-LAT (both flux and spectral index above 100 MeV; the downward arrow for MJD 55 646–55 649 indicates a 95% confidence level upper limit on the flux); X-ray data from RXTE; optical R-band photometric observations from the KVA telescope; optical polarisation measurements (both percentage of polarised flux and degree of polarisation) from the KVA (filled circles) and Liverpool telescopes (open triangles); and radio observations at 37 GHz and 15 GHz provided by the Metsähovi and OVRO telescopes, respectively.
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