tokens: Acknowledgments BK, SK and LT acknowledge Shota Rustaveli National Science Foundation and Ilia State University for the fundamental research grant FR/377/6-290/14. KM and DD acknowledge the funding by the German BMBF (Verbundforschung Astro- und Astroteilchenphysik) and HAP (Helmholtz Alliance for Astro-particle Physics). PR acknowledges the contract ASI-INAF I/004/11/0. We acknowledge the helpful service of heasarc , and the use of public data from the Swift and Fermi archives. This research has made use of the xrtdas software, developed under the responsibility of the ASDC, Italy, and the data from the OVRO 40-m monitoring programme that is supported in part by NASA grants NNX08AW31G and NNX11A043G, and NSF grants AST-0808050 and AST-1109911. In our study, the data from the Steward Observatory spectropolarimetric monitoring project supported by Fermi Guest Investigator grants NNX08AW56G, NNX09AU10G, NNX12AO93G and NNX15AU81G were used. We thank the FACT Collaboration for making their analysis results publicly available, and appreciate their long-term monitoring initiative that provides precious input for MWL studies. We thank the anonymous referee for his/her very useful comments and suggestions that helped to improve the quality of the paper.
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