  We have performed a ROSAT follow-up observation of the X-ray transient SAX
J1810.8-2609 on March 24, 1998 and detected a bright X-ray source (named RX
J1810.7-2609) which was not detected during the ROSAT all-sky survey in
September 1990. Optical-to-infrared follow-up observations of the 10 arcsec
radius ROSAT HRI X-ray error box revealed one variable object (R = 19.5+/-0.5
on 13 March, R>21.5 on 27 Aug 1998) which we tentatively propose as the
optical/IR counterpart of RX J1810.7-2609 = SAX J1810.8-2609.
