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Context. Close binary supersoft X-ray sources (CBSS) are binary systems thatcontain a white dwarf with stable nuclear burning on its surface. Thesesources, first discovered in the Magellanic Clouds, have high accretion ratesand near-Eddington luminosities (10^37 - 10^38 erg/s) with high temperatures (T= 2 - 7 x 10^5 K). Aims. The total number of known objects in the MC is stillsmall and, in our galaxy, even smaller. We observed the field of theunidentified transient supersoft X-ray source RX J0527.8-6954 in order toidentify its optical counterpart. Methods. The observation was made with theIFU-GMOS on the Gemini South telescope with the purpose of identifying starswith possible He II or Balmer emission or else of observing nebular extendedjets or ionization cones, features that may be expected in CBSS. Results. TheX-ray source is identified with a B5e V star that is associated withsubarcsecond extended Halpha emission, possibly bipolar. Conclusions. If theprimary star is a white dwarf, as suggested by the supersoft X-ray spectrum,the expected orbital period exceeds 21 h; therefore, we believe that the 9.4 hperiod found so far is not associated to this system.

Optical identification of the transient supersoft X-ray source RX J0527.8-6954, in the LMC