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Extreme high-synchrotron-peak blazars (EHSPs) are postulated as the mostefficient and extreme particle accelerators in the universe but remainenigmatic as a possible new class of TeV gamma-ray blazars. Blazars are activegalactic nuclei (AGNs) with jets of relativistic particles that generatenon-thermal emission pointed along the line-of-sight. Their spectral energydistribution (SED) are characterized by synchrotron and inverse-Compton peaks,indicating acceleration of leptonic and possibly hadronic particle populationsin the jet. EHSPs are characterized by a peak synchrotron frequency > 1017 Hzwith their Compton peak expected to fall in the TeV range. Indeed, the handfulof EHSPs detected by Imaging Air Cherenkov Telescopes (IACTs) have presentedchallenges where some may be a high-frequency extension of the blazar sequencewhile others peaking around 10 TeV may represent a different class of TeVemitters. Detections of the high-energy and very-high-energy (HE; E > 100 MeV,VHE; E > 100 GeV) components of the Compton peak will play an important role inconstraining the acceleration model derived from the SED. We present thediscovery of TeV emission from RBS 1366, a candidate EHSP, by the VERITASobservatory. Using HE and VHE data from the Fermi-LAT and VERITASobservatories, respectively, we characterize the detection by providing an SEDand model fit in the context of other EHSP candidates. Our work confirms thestatus of RBS 1366 as an EHBL.

TeV Detection of the Extreme HSP Blazar RBS 1366 by VERITAS