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We present ~2000 polarimetric and ~3000 photometric observations of 15gamma-ray bright blazars over a period of 936 days (11/10/2008 - 26/10/2012)using data from the Tuorla blazar monitoring program (KVA DIPOL) and LiverpoolTelescope (LT) RINGO2 polarimeters (supplemented with data from SkyCamZ (LT)and Fermi-LAT gamma-ray data). In 11 out of 15 sources we identify a total of19 electric vector position angle (EVPA) rotations and 95 flaring episodes. Wegroup the sources into subclasses based on their broadband spectralcharacteristics and compare their observed optical and gamma-ray properties. Wefind that (1) the optical magnitude and gamma-ray flux are positivelycorrelated, (2) EVPA rotations can occur in any blazar subclass, 4 sources showrotations that go in one direction and immediately rotate back, (3) we see nodifference in the gamma-ray flaring rates in the sample; flares can occurduring and outside of rotations with no preference for this behaviour, (4) theaverage degree of polarisation (DoP), optical magnitude and gamma-ray flux arelower during an EVPA rotation compared with during non-rotation and thedistribution of the DoP during EVPA rotations is not drawn from the same parentsample as the distribution outside rotations, (5) the number of observedflaring events and optical polarisation rotations are correlated, however wefind no strong evidence for a temporal association between individual flaresand rotations and (6) the maximum observed DoP increases from ~10% to ~30% to~40% for subclasses with synchrotron peaks at high, intermediate and lowfrequencies respectively.

The RINGO2 and DIPOL Optical Polarisation Catalogue of Blazars