Confirming the compact X-ray binary in a new supernova remnant G308.3-1.4

We have identified a central compact object (CCO) in the newly identifiedsupernova remnant G308.31.4. An interesting periodicity candidate of 1.4 hourshas been found in a short exposure by Chandra. Together with its fluxvariability, this object resembles the wellknown CCO associated with RCW 103.However, different from the case in RCW 103, optical/IR counterpart of the CCOin G308.31.4 is unambiguously identified and its spectral energy distributionsuggests it as a promising compact binary candidate. We propose a XMMNewtonobservation to confirm the nature of this object so as to search for the directevidence of a compact binary survived in a supernova. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]