Abstract
We report on the discovery of a very low mass (VLM) star in the solar neighborhood, originally identified as an optical counterpart of a flaring X-ray source detected in the ROSAT All-Sky survey. Optical spectroscopy and infrared photometry consistently reveal a spectral type of $\rm M\,9\, \pm\, 0.5$ and a distance of ≈ $11\,\pm\,2$ pc. The optical counterpart of 1RXS J115928.5-524717 shows a large proper motion of $1.08\,\pm\,0.06\arcsec$/year. 1RXS J115928.5-524717 is the fourth object among the VLM stars displaying a huge X-ray flare, reaching the unprecedent value of $L_X/L_{\rm bol}\simeq 0.1$.
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