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| - The identification of the optical/IR counterpart of the 29.5-s transient X-ray pulsar GS 1843+009
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| - We report on the identification of the optical/IR counterpart of the 29.5-s transient X-ray pulsar GS 1843+009. We re-analysed an archival ROSAT HRI observation of GS 1843+009 obtaining a new refined position. The optical and IR follow-up observations carried out for the new error circle allowed us to find 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-Ve spectral-type star located at a distance of ≥ 10 kpc confirming the Be-star/X-ray binary nature of GS 1843+009.
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