Burst and Persistent Emission Properties During the Recent Active Episode of the Anomalous X-Ray Pulsar 1e 1841–045

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The Swift /Burst Alert Telescope detected the first burst from 1E 1841−045 in 2010 May with intermittent burst activity recorded through at least 2011 July. Here we present Swift and Fermi /Gamma-ray Burst Monitor observations of this burst activity and search for correlated changes to the persistent X-ray emission of the source. The T 90 durations of the bursts range between 18 and 140 ms, comparable to other magnetar burst durations, while the energy released in each burst ranges between (0.8–25) × 10 38 erg, which is on the low side of soft gamma repeater 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.