Swift phase-coherent P-Pdot solution for the 1E1547.0-5408 outburst

Swift XRT monitored 1E1547.0-5408 in the latest 5 days starting from about 90 seconds since the BAT trigger (Krimm et al. GCN 8311, 8312). During this period observations in the WT mode were carried out for a total exposure time of about 37ks. After having removed bursts and corrected the photon arrival times to the barycenter of the Solar System, the dataset was used to infer a phase-coherent timing solution including both a period and period derivative component.