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We explore the possibility that GSC 07396-00759 (spectral type M1e) is awidely separated (~2.82', or projected separation ~12,350 AU) companion to the"old" (age ~12 Myr) classical T Tauri binary system V4046 Sgr AB, as suggestedby the proximity and similar space motions of the two systems. If the twosystems are equidistant and coeval, then GSC 07396--00759, like V4046 Sgr AB,must be a spectroscopic binary with nearly equal-mass components, and V4046 Sgrmust be at least ~8 Myr old. Analysis of a serendipitous Chandra X-ray gratingsspectrum and light curve as well as XMM-Newton light curves and CCD spectra ofGSC 07396-00759 obtained during long exposures targeting V4046 Sgr AB reveals arelatively hard (T_X ~ 10^7 K) X-ray spectrum, strong flaring, and relativelylow-density plasma. These X-ray characteristics of GCS 07396--00759 areindicative of a high level of coronal activity, consistent with its apparentweak-lined T Tauri star status. Interactions between V4046 Sgr AB and GCS07396-00759 when the two systems were more closely bound may be responsible for(a) their dissolution ~10^6 yr ago, (b) the present tight, circular orbit ofV4046 Sgr AB, and (c) the persistence of the gaseous circumbinary disk stillorbiting V4046 Sgr AB.

GSC 07396-00759 = V4046 Sgr C[D]: a Wide-separation Companion to the Close T Tauri Binary System V4046 Sgr AB