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Context. The gamma-ray emitting source WISE J141046.00+740511.2 has beenassociated with a Fermi-LAT detection by crossmatching with Swift/XRT data. Ithas shown all the canonical observational characteristics of a BL Lac source,including a power-law, featureless optical spectrum. However, it was onlyrecently detected at radio frequencies and its radio flux is significantly low.Aims. Given that a radio detection is fundamental to associate lower-energycounterparts to Fermi-LAT sources, we aim to unambiguously classify this sourceby performing a multiwavelength analysis based on contemporaneous data.Methods. By using multifrequency observations at the Jansky Very Large Array,Giant Metrewave Radio Telescope, Gran Telescopio Canarias, Gemini, WilliamHerschel Telescope and Liverpool observatories, together with Fermi-LAT andSwift data, we carried out two kinds of analyses. On one hand, we studiedseveral known parameters that account for the radio loudness or weaknesscharacterization and their application to blazars (in general) and to oursource (in particular). And, on the other hand, we built and analyzed theobserved spectral energy distribution (SED) of this source to try to explainits peculiar characteristics. Results. The multiwavelength analysis indicatesthat WISE J141046.00+740511.2 is a blazar of the high-frequency peaked (HBL)type that emits highly polarized light and that is likely located at a lowredshift. In addition, the one-zone model parameters that best fit its SED arethose of an extreme HBL (EHBL); this blazar type has been extensively predictedin theory to be lacking in the radio emission that is otherwise typical ofcanonical gamma-ray blazars. Conclusions. We confirm that WISEJ141046.00+740511.2 is indeed a highly polarized BL Lac of the HBL type.Further studies will be conducted to explain the atypical low radio fluxdetected for this source.

Disentangling the nature of the prototype radio weak BL Lac: Contemporaneous multifrequency observations of WISE J141046.00 + 740511.2