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   53019
   The BL Lac source MS~0205.7+3509 is one of a small class of four BL Lac
   objects that are signficantly decentered with respect to their "host"
   galaxy, underluminous for a typical BL Lac host, show exces s
   absorption in soft X-rays and are probably microlensed but show no
   evidence for multiple images. We propose ASCA observations of the X-ray
   selected BL Lac MS 0205.7+3509 (Z$>$0.318) in order to (i) determine
   the main emission processes responsible for its x-ray spectrum, (ii)
   define its broadband (radio to X-ray) spectrum from which we can
   estimate its radio-X-ray bolometric luminosity and spectral break
   frequency and (iii) understand the role played by gravitational
   microlensing. Simultaneous IR, optical and radio monitoring will be
   used in the investigation.
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