XMM monitoring of the newly discovered transient Magnetar SGR1935+2154

SGR1935+2154 is the latest discovered member of the rapidly increasing class ofmagnetars and has been discovered due to its transient behaviour and theemission of short and intense (F_X > 10 Crabs) bursts. We have inferred theperiod of the source (3.2s) while the first period derivative is stillundetected preventing us to infer its main parameters. Moreover, unexpectedly wefound a diffuse emission component around the pulsar. This nebula might beeither the second strongest candidate for the elusive magnetar wind Nebula or adust scattering halo. We request two pointings of 40 and 60ks aimed at: i)inferring the main pulsar parameters, ii) monitoring its decay, iii) looking forits quiescent state, and carry out a detailed study of the extended emission. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]