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  • Pandey, Ashwani; Gupta, Alok C; Kurtanidze, Sofia O; Wiita, Paul J; Damljanovic, G; Bachev, R; Zhang, Jin; Kurtanidze, O M; Darriba, A; Chigladze, R A; Latev, G; Nikolashvili, M G; Peneva, S; Semkov, E; Strigachev, A; Tiwari, S N; Vince, O

    arXiv.org, 01/2020
    Paper, Journal Article

    We report the results of our optical (VRI) photometric observations of the TeV blazar 1ES 0806\(+\)524 on 153 nights during 2011-2019 using seven optical telescopes in Europe and Asia. We investigated the variability of the blazar on intraday as well as on long-term timescales. We examined eighteen intraday light curves for flux and color variations using the most reliable power-enhanced F-test and the nested ANOVA test. Only on one night was a small, but significant, variation found, in both \(V\) band and \(R\) band light curves. The \(V-R\) color index was constant on every one of those nights. Flux density changes of around 80 % were seen over the course of these eight years in multiple bands. We found a weighted mean optical spectral index of 0.639\(\pm\)0.002 during our monitoring period by fitting a power law (\(F_{\nu} \propto \nu^{-\alpha}\)) in 23 optical (\(VRI\)) spectral energy distributions of 1ES 0806\(+\)524. We discuss different possible mechanisms responsible for blazar variability on diverse timescales.