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It is a debated topic whether the very massive stars end their lives with supernova explosions or not. Finding a supernova remnant openParSNRclosePar hosting a black hole can provide direct evidence for the former scenario. SS 433 comma in the giant bubble W50 comma is a paradigmatic micro-quasar containing a virgul16Msun black hole. Its SNR has not been firmly established comma as its energetic jets are considered as the major source to produce W50. The ROSAT image shows thermal structures in the north of W50 comma which are far from the jet precession cone. We propose 72 ks XMM- Newton observation toward the northern shell of W50 comma aiming to find signatures of a SNR and to study the explosion mechanism of SS433 s supernova. A non- detection would provide evidence that multiple episodes of jets in the past.