086014

We request an observation of a newly discovered X-ray transient and black hole candidate. The source is now entering quiescence comma following a months. long outburst. X-ray imaging and spectroscopy with Chandra suggest interactions with ambient media on small angular scales comma and MeerKAT observations at 1.28 GHz reveal a radio bubble or possible supernova remnant on large angular scales. The detection of a black hole in a remnant would upend some prevalent ideas regarding black hole birth events. The sensitivity and broad field of view and of XMM-Newton offer the best chance to detect a putative remnant in X-rays. We request a 10 ks openPartotalclosePar observation to image the field around the source.