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The ROSAT X-ray source 1RXS J114003.0+124112 was identified as a starburstgalaxy at redshift 0.177 by He et al. (2001). Meanwhile, the authors also notedthat the source is almost two orders of magnitude brighter in X-ray than theX-ray-brightest starburst galaxy and it seems to be in a merging system, makingthis source an enigmatic system for further observations. This paper reportsthe re-identification of 1RXS J114003.0+124112 with the observations on the 2.6m telescope at Byurakan Astrophysical Observatory, Armenia and with the SDSSdata. The results indicate that the starburst activity is associated with thebrighter object in the system, while the fainter object is a typical Seyfert 1galaxy at redshift 0.282. Therefore, the two objects are not in a mergingsystem, and the Seyfert 1 galaxy naturally accounts for the high X-ray flux.Three more objects reside in the vicinity, but they are all too faint to beresponsible for the high X-ray flux.Comment: 7 pages, 3 figures, to be published in ChJA

Re-Identification of the `Enigmatic' X-ray Source 1RXS J114003.0+124112