| Abstract
| - Context. The H.E.S.S. Collaboration dicovered a new TeV point-like source HESS J1943+213 in the Galactic plane and suggested three possible low-energy-band counterparts: a γ-ray binary, a pulsar wind nebula (PWN), or a BL Lacertae object. Aims. We measure the distance to the radio counterpart G57.76-1.29 of HESS J1943+213. Methods. We analyze Very Large Array observations to obtain a reliable HI absorption spectrum. Results. The resulting distance limit is ≥ 16 kpc. This distance strongly supports that HESS J1943+213 is an extragalactic source, consistent with the preferred counterpart of the H.E.S.S. Collaboration .
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