Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: INTEGRAL discovery of a burst with associated radio emission from the
  magnetar SGR 1935+2154   We report on INTEGRAL observations of the soft $\gamma$-ray repeater SGR
1935+2154 performed between 2020 April 28 and May 3. Several short bursts with
fluence of $\sim10^{-7}-10^{-6}$ erg cm$^{-2}$ were detected by the IBIS
instrument in the 20-200 keV range. The burst with the hardest spectrum,
discovered and localized in real time by the INTEGRAL Burst Alert System, was
spatially and temporally coincident with a short and very bright radio burst
detected by the CHIME and STARE2 radio telescopes at 400-800 MHz and 1.4 GHz,
respectively. Its lightcurve shows three narrow peaks separated by $\sim$29 ms
time intervals, superimposed on a broad pulse lasting $\sim$0.6 s. The
brightest peak had a delay of 6.5$\pm$1.0 ms with respect to the 1.4 GHz radio
pulse (that coincides with the second and brightest component seen at lower
frequencies). The burst spectrum, an exponentially cut-off power law with
photon index $\Gamma=0.7_{-0.2}^{+0.4}$ and peak energy $E_p=65\pm5$ keV, is
harder than those of the bursts usually observed from this and other magnetars.
By the analysis of an expanding dust scattering ring seen in X-rays with the
{\it Neil Gehrels Swift Observatory} XRT instrument, we derived a distance of
4.4$_{-1.3}^{+2.8}$ kpc for SGR 1935+2154, independent of its possible
association with the supernova remnant G57.2+0.8. At this distance, the burst
20-200 keV fluence of $(6.1\pm 0.3)\times10^{-7}$ erg cm$^{-2}$ corresponds to
an isotropic emitted energy of $\sim1.4\times10^{39}$ erg. This is the first
burst with a radio counterpart observed from a soft $\gamma$-ray repeater and
it strongly supports models based on magnetars that have been proposed for
extragalactic fast radio bursts.

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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: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat