Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong bursts from the anomalous X-ray pulsar 1E 1547.0-5408 observed
  with the INTEGRAL/SPI Anti-Coincidence Shield   In January 2009, multiple short bursts of soft gamma-rays were detected from
the direction of the anomalous X-ray pulsar 1E 1547.0-5408 by different
satellites. Here we report on the observations obtained with the INTEGRAL
SPI-ACS detector during the period with the strongest bursting activity. More
than 200 bursts were detected at energies above 80 keV in a few hours on
January 22. Among these, two remarkably bright events showed pulsating tails
lasting several seconds and modulated at the 2.1 s spin period of 1E
1547.0-5408. The energy released in the brightest of these bursts was of a few
10^43 erg, for an assumed distance of 10 kpc. This is smaller than that of the
three giant flares seen from soft gamma-ray repeaters, but higher than that of
typical bursts from soft gamma-ray repeaters and anomalous X-ray pulsars.

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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat