GRO J1744-28 was discovered in December 1995 and has become one of
the brightest sources in the X-ray sky. The bimodal behaviour (dis-
playing X-ray bursts at an average rate of 1-2 per hour and the
appearance of pulsations at 467 ms) makes of this source a unique
object in our Galaxy.
No optical/IR counterpart has yet been identified, due to the
location of the source in the vecinity of the Galactic Center,
and the presence of a foreground star in the line of sight of a
variable radiosource, presumably associated with GRO J1744-28.
As we stated in a recent IAU Circular (IAUC 6339), we believe that
only thermal imaging may reveal the counterpart.
We believe that the ISO CAM is the only instrument that can perform
such observations. Moreover, the X-ray flux is decaying rapidly and
therefore, we suggest to perform the observations as soon as possible
(preferably on 15 April). The ISO viewing window for this source
ends in late April.