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Context. QSO B1420+326 is a blazar classified as a Flat Spectrum Radio Quasar(FSRQ). In the beginning of 2020 it underwent an enhanced flux state. Anextensive multiwavelength campaign allowed us to trace the evolution of theflare. Aims. We search for VHE gamma-ray emission from QSO B1420+326 duringthis flaring state. We aim to characterize and model the broadband emission ofthe source over different phases of the flare. Methods. The source was observedwith a number of instruments in radio, near infrared, optical (includingpolarimetry and spectroscopy), ultra-violet, X-ray and gamma-ray bands. We usededicated optical spectroscopy results to estimate the accretion disk and thedust torus luminosity. We perform spectral energy distribution modeling in theframework of combined Synchrotron-Self-Compton and External Compton scenario inwhich the electron energy distribution is partially determined fromacceleration and cooling processes. Results. During the enhanced state the fluxof both SED components drastically increased and the peaks were shifted tohigher energies. Follow up observations with the MAGIC telescopes led to thedetection of very-high-energy gamma-ray emission from this source, making itone of only a handful of FSRQs known in this energy range. Modeling allows usto constrain the evolution of the magnetic field and electron energydistribution in the emission region. The gamma-ray flare was accompanied by arotation of the optical polarization vector during a low polarization state.Also, a new, superluminal radio knot contemporaneously appeared in the radioimage of the jet. The optical spectroscopy shows a prominent FeII bump withflux evolving together with the continuum emission and a MgII line with varyingequivalent width.

VHE gamma-ray detection of FSRQ QSO B1420+326 and modeling of its enhanced broadband state in 2020