Burst and persistent emission properties during the recent active episode of the anomalous x-ray pulsar 1E 1841-045
Lin, Lin and Kouveliotou, Chryssa and Göğüş, Ersin and van der Horst, Alexander J. and Watts, Anna L. and Baring, Matthew G. and Kaneko, Yuki and Wijers, Ralph A. M. J. and Woods, Peter M. and Barthelmy, Scott and Burgess, James Michael and Chaplin, Vandiver and Gehrels, Neil and Goldstein, Adam and Granot, Jonathan and Guiriec, Sylvain and Mcenery, Julie and Preece, Robert D. and Tierney, David and van der Klis, Michiel and von Kienlin, Andreas and Zhang, Shuang Nan (2011) Burst and persistent emission properties during the recent active episode of the anomalous x-ray pulsar 1E 1841-045. Astrophysical Journal Letters, 740 (1). ISSN 2041-8205 (Print) 2041-8213 (Online)
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Official URL: http://dx.doi.org/10.1088/2041-8205/740/1/L16
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) x 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.
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