Optical Follow-Up Of Txs 0506+056 After The Neutrino Detection

TXS 0506+056 is the first blazar, successfully identified as a likely neutrino source. With this work we aim to understand, from the optical variability perspective, how and why this blazar is different from many other similar objects, which have no neutrino emission detected. The object has been monitored for the last 1.5 years on both intra-night and long-term time-scales, primarily with the 60-cm telescope of Belogradchik Observatory, Bulgaria. Our results in the course of this monitoring show "bluer-when-brighter" color changes, significant variability amplitude (almost a magnitude on a month time-scale) and the rare, but prominent intra-night variability. Standard stars have been also calibrated in the field of this object as a part of this work. Our results suggest that the variability behavior is more typical for an LSP (but perhaps not a FSRQ) than for a HSP blazar.