Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hard X-ray variability of Magnetar's Tails observed with INTEGRAL   Magnetar's persistent emission above 10 keV was recently discovered thanks to
the imaging capabilities of the IBIS coded mask telescope on board the INTEGRAL
satellite. The only two sources that show some degree of long term variability
are SGR 1806-20 and 1RXS J170849.0-400910. We find some indications that
variability of these hard tails could be the driver of the spectral variability
measured in these sources below 10 keV. In addition we report for the first
time the detection at 2.8 sigma level of pulsations in the hard X-ray tail of
SGR 1806-20.

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The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: eess
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
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The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat