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Burst and Persistent Emission Properties during the Recent Active Episode of the Anomalous X-ray Pulsar 1E 1841-045

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arxiv 1109.0991 v1 pith:YGSVW2KP submitted 2011-09-05 astro-ph.HE

Lin Lin , Chryssa Kouveliotou , Ersin Gogus , Alexander J. van der Horst , Anna L. Watts , Matthew G. Baring , Yuki Kaneko , Ralph A.M.J. Wijers
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Peter M. Woods Scott Barthelmy J. Michael Burgess Vandiver Chaplin Neil Gehrels Adam Goldstein Jonathan Granot Sylvain Guiriec Julie Mcenery Robert D. Preece David Tierney Michiel van der Klis Andreas von Kienlin Shuang Nan Zhang
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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.

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