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We report on the discovery of the optical/IR counterpart of the 15.8stransient X-ray pulsar XTE J1946+274. We re-analysed archival BeppoSAXobservations of XTE J1946+274, obtaining a new refined position (a circle with22" radius at 90% confidence level). Based on this new position we carried outoptical and infra-red (IR) follow-up observations. Within the new error circlewe found a relatively optical faint (B=18.6) IR bright (H=12.1) early typereddened star (V--R=1.6). The optical spectra show strong H-alpha and H-betaemission lines. The IR photometric observations of the field confirm thepresence of an IR excess for the H-alpha--emitting star (K=11.6, J--H=0.6)which is likely surrounded by a circumstellar envelope. Spectroscopic andphotometric data indicate a B0--1V--IVe spectral-type star located at adistance of 8--10kpc and confirm the Be-star/X-ray binary nature of XTEJ1946+274.Comment: Accepted for publication on A&A (7 pages and 4 figures

The identification of the optical/IR counterpart of the 15.8-s transient X–ray pulsar XTE J1946+274