Into Unknown Territory: late XMM-Newton observations of GRB130427A

GammaRay Burst (GRB) 130427A is an outstanding event, having the highestgammaray fluence of any GRB detected in almost 30 years. Its Xray and opticalafterglows are extraordinarily bright as well, and this event has potential tobe the longest observable GRB since the launch of Swift. We propose to observethis exceptional GRB with XMMNewton virgul2 years after the trigger, to determinethe late behaviour of its Xray afterglow. It represents an unique opportunityto detect and study an Xray afterglow at such late times. Determining thespectral and temporal indices of the X ray emission will give us a better gripon the environment and test explosion models. The proposed observations are anextension of those already performed on this burst by the PI with XMMNewton. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]