Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ten years of INTEGRAL observations of the hard X-ray emission from SGR
  1900+14   We exploited the high sensitivity of the INTEGRAL IBIS/ISGRI instrument to
study the persistent hard X-ray emission of the soft gamma-ray repeater SGR
1900+14, based on ~11.6 Ms of archival data. The 22-150 keV INTEGRAL spectrum
can be well fit by a power law with photon index 1.9 +/- 0.3 and flux F_x =
(1.11 +/- 0.17)E-11 erg/cm^2/s (20-100 keV). A comparison with the 20-100 keV
flux measured in 1997 with BeppoSAX, and possibly associated with SGR 1900+14,
shows a luminosity decrease by a factor of ~5. The slope of the power law above
20 keV is consistent within the uncertainties with that of SGR 1806-20, the
other persistent soft gamma-ray repeater for which a hard X-ray emission
extending up to 150 keV has been reported.

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The categories of this paper are: eess
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th