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The well-studied X-ray/Optical/Radio supernova remnant DDB 1-15 (CXOM31J004327.8+411829; r3-63) in M31 has been investigated with archival XMM-Newtonand Chandra observations. The timing data from XMM-Newton reveals a powerdensity spectrum (PDS) characteristic of accreting compact objects in X-raybinaries (XRBs). The PDS shows features typical of Roche lobe overflowaccretion, hinting that the XRB is low-mass. The Chandra observations resolvethe SNR into a shell and show a variable count rate at the 94% confidence levelin the northwest quadrant. Together, these XMM-Newton and Chandra data suggestthat there is an XRB in the SNR r3-63 and that the XRB is located in thenorthwestern portion of the SNR. The currently-available X-ray and optical datashow no evidence that the XRB is high-mass. If the XRB is low-mass, r3-63 wouldbe the first SNR found to contain a low-mass X-ray binary.

A Potential Supernova Remnant/X-ray Binary Association in M31