Burst and Persistent Emission Properties during the Recent Active   Episode of the Anomalous X-ray Pulsar 1E 1841-045
  Swift/BAT detected the first burst from 1E 1841-045 in May 2010 with intermittent burst activity recorded through at least July 2011. Here we present Swift and Fermi/GBM observations of this burst activity and search for correlated changes to the persistent X-ray emission of the source. The T90 durations of the bursts range between 18-140 ms, comparable to other magnetar burst durations, while the energy released in each burst ranges between (0.8 - 25)E38 erg, which is in the low side of SGR bursts. We find that the bursting activity did not have a significant effect on the persistent flux level of the source. We argue that the mechanism leading to this sporadic burst activity in 1E 1841-045 might not involve large scale restructuring (either crustal or magnetospheric) as seen in other magnetar sources. 
Lin Lin, Chryssa Kouveliotou, Ersin Gogus, Alexander J. van der Horst,   Anna L. Watts, Matthew G. Baring, Yuki Kaneko, Ralp...
astro-ph.HE