X-ray Observations of Rapid comma Luminous and Blue Stellar Explosions

We propose an indepth Xray study of fastevolving, blue optical transients(FBOTs). FBOTs are a new class of explosions with luminosities and time scalesof evolution that challenge traditional Supernova (SN) models. To date, FBOTshave mostly been studied in the optical/UV, which is of thermal origin and it isnot sensitive to the nature of the underlying energy source and properties ofthe explosion.s fastest ejecta. Here we propose to capitalize on our recentdiscovery of the first Xray emission from a FBOT and start the first Xraymonitoring campaign of nearby FBOTs. The primary goals are to (i) obtain thefirst constraints on the massloss history of the stellar progenitors of a newclass of SN explosions; (ii) test the presence of engines driving the explosions. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]