  We present the analysis of the Chandra image of KS 1731-260. The improvement
of the source localization (down to ~0.6'') allowed us to rule out 12 of 13
infrared companion candidates proposed by Barret et al. (1998). The remaining
possible infrared counterpart of KS 1731-260 (angular distance between sources
~1.45'', or ~2\sigma) has the brightness m_{J}~16 in the J band. If this star
is really the counterpart of KS 1731-260, the lower limit on its luminosity is
L_{tot}>L_{J,H}~10L_{\odot}. The strong drop of the X-ray flux from the source
allow us to propose the additional check of whether the decribed star is the
real counterpart of KS1731-260. If the optical and infrared brightness of the
binary system is partially caused by the reprocessing of X-rays, as it is usual
for the low mass binary systems, the infrared brightness of real counterpart
should strongly reduce in 2001, when the X-ray flux from KS1731-260 turned off
(Wijnands et al. 2001)
