We propose to observe with ISOCAM and ISOPHOT the superluminal galactic
source GRS 1915+105. The first aim of the observations is to test the
idea that this is a stellar black hole in a giant molecular cloud.
If the source injects X-ray photons and relativistic plasma clouds
into the dense molecular cloud, the heated dust will radiate in the
infrared. We will map the dust emission and the gradients in
temperature will provide a direct test for the physical association
between the compact source and the molecular cloud. This unique
source may be the best laboratory to study the poorly understood
phenomena at the interface between High Energy Astrophysics and the
Physics of the Cold Interstellar Medium.

The spectral information will, in addition, be used to distinguish
interstellar dust emission from the X-ray driven free-free
mid-infrared emission from the accretion disk around the black hole.

The superluminal source is a target for launch in autumn. For a
launch in spring we propose to observe the best known black hole
candidate A0620-00, which has been detected at 3.5 microns.