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GRS 1747$-$312 is a neutron star Low-Mass X-ray Binary in the globularcluster Terzan 6, located at a distance of 9.5 kpc from the Earth. During itsoutbursts, periodic eclipses were known to occur. Observations for theoutbursts were performed with Chandra in 2004 and Swift in 2013. XMM-Newtonobserved its quiescent state in 2004. In addition, when Suzaku observed it in2009 as a part of Galactic center mapping observations, GRS 1747$-$312 wasfound to be in a low luminosity state with $L_{\rm x} \sim 1.2 \times 10^{35}$erg s$^{-1}$. All of the observations except for XMM-Newton included the timeof the eclipses predicted. We analyzed archival data of these observations.During the Chandra and Swift observations, we found clear flux decreases at theexpected time of the eclipses. During the Suzaku observation, however, therewere no clear signs for the predicted eclipses. The lapse of the predictedeclipses during the Suzaku observation can be explained by a contaminant sourcequite close to GRS 1747$-$312. When GRS 1747$-$312 is in the quiescent state,we observe X-rays from the contaminant source rather than from GRS 1747$-$312.However, we have no clear evidence for the contaminant source in our data. Thelapse might also be explained by thick material ($N_{\rm H} > 10^{24}$cm$^{-2}$ ) between the neutron star and the companion star, though the originof the thick material is not clear.

Peculiar Lapse of Periodic Eclipsing Event at Low Mass X-ray Binary GRS 1747$-$312 during Suzaku Observation in 2009