A Study of the Flaring Blazar 1ES 1727+502 with VERITAS

We report on the observations of the blazar 1ES 1727+502 with VERITAS during March 2025, in response to a Target of Opportunity (ToO) alert of a flare received from LHAASO via an Astronomer’s Telegram (ATel #17099). The blazar 1ES 1727+502 is a high-frequency-peaked BL Lac, belonging to the class of active galactic nuclei (AGN) with their jets pointed in the direction of the observer. The long-term monitoring of this source by VERITAS post the bright LHAASO flare provides a highly detailed view of the elevated VHE post-flare state. VERITAS (Very Energetic Radiation Imaging Telescope Array System) is an array of four imaging atmospheric Cherenkov telescopes, located in southern Arizona, sensitive to gamma rays from 80 GeV to > 30 TeV.