Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrahigh Energy Activity in Giant Magnetar Outbursts   The recent superflare of 27 December 2004 from the magnetar SGR 1806-20 was
the brightest extrasolar flash ever recorded in the modern era. The chances for
seeing exotic ultrahigh energy (UHE) radiation - neutrons, neutrinos, gamma
rays and charged cosmic rays - from it are far better from an energetic point
of view than from cosmological gamma ray bursts (GRBs). The chances for
detecting the various components are discussed in light of recent data from the
27 December event.

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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg