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   51061
   GRS 1739-278 is a new X-ray nova discovered in Mar. 1996. Forty days
   after the onset of the X-ray outburst, a radio outburst was observed.
   Such delayed radio outburst is peculiar to transient jet systems like
   GRO J1655-40 or GRS 1915+105. Therefore, GRS 1739-278 is suspected to
   be third transient jet source. If it is a jet system, resonance
   absorption lines or Doppler-shifted emission lines are expected to be
   found, as the cases of other ASCA observations of jet systems. We
   propose a simultaneous observation of GRS 1739-278 with radio to
   explore its nature. This observation would test the anti-correlation of
   the X-ray and the radio emission, which is predicted by a jet-
   supression scenerio, and would be a clue to the mechanism of the
   resonance absorption detected in the jet systems.
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