Monitoring the 2018 X-ray Outburst of XTE J1810-197

TWO DAYS FOLLOWING REPORTS OF AN OUTBURST FROM THE TRANSIENT ANOMOLOUS X-RAY PULSAR (AXP) XTE J1810-197 WE OBTAINED A NUSTAR DDT OBSERVATION TO CHARACTERIZE ITS OUTBURST PROPERTIES. THUS 15 YEARS AFTER THE 2003 DISCOVERY OF THIS THE FIRST KNOWN TRANSIENT AND RADIO AXP IT IS POSSIBLE TO STUDY THE ORIGIN AND DECAY OF MAGNETAR EMISSION IN EXQUISITE DETAIL FROM THE BEGINNING OF THE OUTBURST IN A UNIQUELY ACCESSIBLE SOURCE. WE HAVE ALREADY IDENTIFIED FOR THE FIRST TIME NEW HARD SPECTRAL COMPONENT AND ENERGY-DEPENDENT TIMING BEHAVIOR. WE PROPOSE HERE TO MONITOR THE EARLY X-RAY SPECTRAL AND PULSED EVOLUTION OF XTE J1810-197 MEASURING THE SURFACE THERMAL HOT SPOTS AND MAGNETIC FIELD CONFIGURATION TO COMPARE WITH THE ORIGINAL OUTBURST AT A SIMILAR EPOCH.