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We report on the identification of the optical/IR counterpart of the 29.5-stransient X-ray pulsar GS 1843+009. We re-analysed an archival ROSAT HRIobservation of GS 1843+009, obtaining a new refined position. The optical andIR follow-up observations carried out for the new error circle allowed us tofind a relatively faint (V=20.9) and variable early type reddened star(V-R=2.1). The optical spectra show the Balmer and Paschen series in emission,while the IR observations confirm the presence of a flux excess (H=13.2,J-H=0.54), suggesting that the star is surrounded by a circumstellar envelope.Spectroscopic and photometric data together indicate a B0-B2 IV-Vespectral-type star located at a distance of > 10kpc confirming theBe-star/X-ray binary nature of GS 1843+009.Comment: 6 pages (3 figures included). Accepted for publication in A&

The identification of the optical/IR counterpart of the 29.5-s transient X-ray pulsar GS 1843+009