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Blazars display variable emission across the entire electromagnetic spectrum,with timescales that can range from a few minutes to several years. Our recentwork has shown that a sample of five blazars exhibit hints of periodicity witha global significance $\gtrsim2\,\sigma$ at $\gamma$-ray energies, in the rangeof 0.1~GeV$<$E$<$800~GeV. In this work, we study their multiwavelength (MWL)emission, covering the X-ray, ultraviolet, optical, and radio bands. We showthat three of these blazars present similar periodic patterns in the opticaland radio bands. Additionally, fluxes in the different bands of the fiveblazars are correlated, suggesting a co-spatial origin. Moreover, we detect along-term ($\approx$10 year) rising trend in the light curves of PG~1553+113,and we use it to infer possible constraints on the binary black holehypothesis.

Multiwavelength Analysis of Fermi-LAT Blazars with High-Significance Periodicity: Detection of a Long-Term Rising Emission in PG 1553+113