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 \pm 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 \pm 0.06 hr .
This implies that the inclination angle is larger than 74° .
The 0.1-200 keV unabsorbed peak luminosity is 7 \times 10 ^ { 36 } erg s ^ { -1 } .
The nature of the compact object is unclear .