  Radio and optical observations of the possible microlensed BL Lac source MS
0205.7+3509 were obtained simultaneously with ASCA x-ray measurements in
February 1997. A single power law model, with a photon index of 2.61, is an
adequate fit to the ASCA data, once hydrogenic absorption in excess of the
Galactic value is permitted, confirming a previous ROSAT measurement. On the
basis of our simultaneous data we have determined MS 0205.7+3509 to be a
typical x--ray selected BL Lac, with alpha_xox=-0.82. There is no indication of
an inverse Compton (IC) component in the ASCA spectrum up to 10 keV. No
evidence for variability on hour-long timescales is present in either the x-ray
or the optical data. We discuss these results in the context of a gravitational
microlensing scenario for MS 0205.7+3509.
