The Ringo2 Optical Polarisation Catalogue of 13 VHE Blazars
Time Domain Astronomy with Robotic Telescopes: the Science that Drives the Technology
Helen Jermak
Astrophysics Research Institute, Liverpool John Moores University
U. Barres de Almeida (CBPF), E. Lindfors (Tuorla Observatory), C. Mundell (University of Bath), K. Nilsson (Tuorla Observatory), I. A. Steele (LJMU)
We present the findings of the Ringo2 3 year survey of 13 blazars (3 FSRQs and 10 BL Lacs) with regular coverage and reasonably fast cadence of one to three observations a week. Ringo2 was installed on the Liverpool Robotic Telescope (LT) on the Canary Island of La Palma between 2009 and 2012 and monitored thirteen VHE-emitting blazars in the northern sky. Over half of the sources exhibited an increase in optical flux during this period and almost a quarter were observed in outburst. We compare the optical data to gamma-ray (Fermi/LAT) data during these periods of outburst. In this talk we present the data obtained for all sources over the lifetime of Ringo2 with additional optical data from the KVA telescope and the SkyCamZ wide-field camera (on the LT), we explore the relationship between the change in polarisation angle as a function of time (dEVPA/dMJD) with flux and polarisation degree along with cross correlation comparisons of optical and gam
ma-ray flux.
13:30 - 15:00