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VERITAS is an array of four imaging atmospheric Cherenkov telescopes thatobserves gamma-ray sources in the very high energy range (VHE, E>100 GeV). Alarge fraction of the known gamma-ray sources are of extragalactic origin andbelong to the blazar class: active galactic nuclei with relativistic jetspointing along the line of sight. Gamma-ray emission from blazars is typicallyvariable. Part of the VERITAS observation program is devoted to follow-uptriggers on flaring blazars, initiated by observations at other wavelengths. Wewill present those target of opportunity observations based on optical and GeV(Fermi-LAT) alerts performed with VERITAS during the past 2 seasons, anddiscuss the results in a multiwavelength context.

Target of opportunity observations of flaring blazars with VERITAS