Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broadband X-ray Burst Spectroscopy of the FRB-Emitting Galactic Magnetar   Magnetars are young, magnetically-powered neutron stars possessing the
strongest magnetic fields in the Universe. Fast Radio Bursts (FRBs) are
extremely intense millisecond-long radio pulses of primarily extragalactic
origin, and a leading attribution for their genesis focuses on magnetars. A
hallmark signature of magnetars is their emission of bright, hard X-ray bursts
of sub-second duration. On April 27th 2020, the Galactic magnetar SGR
J1935+2154 emitted hundreds of X-ray bursts in a few hours. One of these
temporally coincided with an FRB, the first detection of an FRB from the Milky
Way. Here we present spectral and temporal analyses of 24 X-ray bursts emitted
13 hours prior to the FRB and seen simultaneously with the NASA NICER and
Fermi/GBM missions in their combined energy range, 0.2 keV-30 MeV. These
broadband spectra permit direct comparison with the spectrum of the
FRB-associated X-ray burst (FRB-X). We demonstrate that all 24 NICER/GBM bursts
are very similar temporally, albeit strikingly different spectrally, from
FRB-X. The singularity of the FRB-X burst is perhaps indicative of an uncommon
locale for its origin. We suggest that this event originated in quasi-polar
open or closed magnetic field lines that extend to high altitudes.

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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom