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Burst and Outburst Characteristics of Magnetar 4U 0142+61

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arxiv 1611.10230 v1 pith:QDRBV5YM submitted 2016-11-30 astro-ph.HE

Ersin Gogus , Lin Lin , Oliver J. Roberts , Manoneeta Chakraborty , Yuki Kaneko , Ramandeep Gill , Jonathan Granot , Alexander J. van der Horst
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Anna L. Watts Matthew Baring Chryssa Kouveliotou Daniela Huppenkothen George Younes
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keywords burstsburstmagnetartailemissionextendedmechanismuncovered
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We have compiled the most comprehensive burst sample from magnetar 4U 0142+61, comprising 27 bursts from its three burst-active episodes in 2011, 2012 and the latest one in 2015 observed with Swift/BAT and Fermi/GBM. Bursts from 4U 0142+61 morphologically resemble typical short bursts from other magnetars. However, 4U 0142+61 bursts are less energetic compared to the bulk of magnetar bursts. We uncovered an extended tail emission following a burst on 2015 February 28, with a thermal nature, cooling over a time-scale of several minutes. During this tail emission, we also uncovered pulse peak phase aligned X-ray bursts , which could originate from the same underlying mechanism as that of the extended burst tail, or an associated and spatially coincident but different mechanism.

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