Image Details
Caption: Figure 1.
Optical magnitudes in the R band (top panel; circles: Abastumani, squares: ATOM, triangles: KVA, pentagons: Crimean and St. Petersburg), V band (second panel; circles: CRTS, squares: Steward), percentage of polarized flux (third panel) and polarization position angle in V band (bottom panel) are shown. For clarity the errors (typically <5%) are not shown. The downward arrows indicate the times of the VHE detections by MAGIC.
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