  Four or five new outbursts were detected of the bright X-ray transient GRS
1747-312 in the globular cluster Terzan 6 between 1996 and 1999, through
monitoring campaigns with the Wide Field Cameras (WFCs) on BeppoSAX and the
Proportional Counter Array (PCA) on RossiXTE. This is the first time that the
source is seen to exhibit recurrent outbursts after the discovery in September
1990 with ART-P on Granat. Three target-of-opportunity observations in 1998 and
1999, with the narrow-field instruments on BeppoSAX and the PCA, revealed one
sharp drop in the flux which we identify as an eclipse of the compact X-ray
source by the companion star. A detailed analysis of WFC data identifies
further eclipses and we measure the orbital period at 12.360+/-0.009 hr. This
is consistent with an identification as a low-mass X-ray binary, as suggested
already by the association with a globular cluster. The eclipse duration is
0.72+/-0.06 hr. This implies that the inclination angle is larger than 74 deg.
The 0.1-200 keV unabsorbed peak luminosity is 7X10^36 erg/s. The nature of the
compact object is unclear.
