Catching profound optical flares in blazars

ABSTRACT Flaring episodes in blazars represent one of the most violent processes observed extra-galactic objects. Studies such events shed light on energetics physical occurring innermost regions blazars, which cannot otherwise be resolved by any current instruments. In this work, we present some largest and rapid flares captured optical band 3C 279, OJ 49, S4 0954+658, TXS 1156+295, PG 1553+113. The source flux was to increase nearly ten times within a time-scale few weeks. We applied several methods time series analysis symmetry analysis. Moreover, also performed searches for periodicity curves 49 1553+113 using Lomb–Scargle method found plausible indications quasi-periodic oscillations (QPOs). particular, 33- 22-day periods i.e. 3:2 ratio, are intriguing. These might originate from magnetohydrodynamical instabilities near base jets, triggered modulated magnetic field accretion disc. qualitative treatment as possible explanation large amplitude changes both source-intrinsic source-extrinsic scenarios.