• blazar
• Gravitational lensing
• PKS1830-211

PKS1830-211 is classified as an Active Galactic Nuclei (AGN). Within the AGN taxonomy, it belongs to the blazars class, the AGN that present a relativistic jet closely aligned with Earth. PKS1830-211 is one of the brightest blazars detected by the Fermi-LAT and is also a remarkable case of strong gravitational lensing. Two galaxies are located in the line of sight between the observer and the blazar, and act as a lens. Their strong gravitational field bends light and splits the image into two primary images. This modifies the travel time and, therefore, the light rays that originate at the same time from the blazar reach the observer in different instants. The aim of the thesis work consists in developing a pipeline to pinpoint the potential temporal delay in gamma-rays between the two mostly magnified images of PKS 1830-211.