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Brightest Cluster Galaxies openParBCGsclosePar residing in the centers of galaxy clusters are typically quenched giant ellipticals. Optical studies hinted comma and our previous XMM-Newton observations confirmed comma that some superluminous disk galaxies are BCGs. The existence of such a BCG population is at odds with our understanding of the formation of these galaxies. Our AO-18 XMM-Newton program aimed to confirm the presence of additional superluminous disk galaxies at the center of galaxy clusters. However comma due to soft proton flares comma one of the most promising superluminous spiral galaxy and its host cluster could not be characterized. We request a short follow-up observation to carry out a dependable analysis of the galaxy cluster and its superluminous spiral BCG.