Broadband X-ray Burst Spectroscopy of the FRB-Emitting Galactic Magnetar. (arXiv:2006.11358v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Younes_G/0/1/0/all/0/1">G. Younes</a> (1,2), <a href="http://arxiv.org/find/astro-ph/1/au:+Baring_M/0/1/0/all/0/1">M. G. Baring</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Kouveliotou_C/0/1/0/all/0/1">C. Kouveliotou</a> (1,2), <a href="http://arxiv.org/find/astro-ph/1/au:+Arzoumanian_Z/0/1/0/all/0/1">Z. Arzoumanian</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Enoto_T/0/1/0/all/0/1">T. Enoto</a> (5), <a href="http://arxiv.org/find/astro-ph/1/au:+Doty_J/0/1/0/all/0/1">J. Doty</a> (6), <a href="http://arxiv.org/find/astro-ph/1/au:+Gendreau_K/0/1/0/all/0/1">K. C. Gendreau</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Gogus_E/0/1/0/all/0/1">E. Göğüş</a> (7), <a href="http://arxiv.org/find/astro-ph/1/au:+Guillot_S/0/1/0/all/0/1">S. Guillot</a> (8), <a href="http://arxiv.org/find/astro-ph/1/au:+Guver_T/0/1/0/all/0/1">T. Güver</a> (9), <a href="http://arxiv.org/find/astro-ph/1/au:+Harding_A/0/1/0/all/0/1">A. K. Harding</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Ho_W/0/1/0/all/0/1">W. C. G. Ho</a> (10), <a href="http://arxiv.org/find/astro-ph/1/au:+Horst_A/0/1/0/all/0/1">A. J. van der Horst</a> (1,2), <a href="http://arxiv.org/find/astro-ph/1/au:+Jaisawal_G/0/1/0/all/0/1">G. K. Jaisawal</a> (11), <a href="http://arxiv.org/find/astro-ph/1/au:+Kaneko_Y/0/1/0/all/0/1">Y. Kaneko</a> (7), <a href="http://arxiv.org/find/astro-ph/1/au:+LaMarr_B/0/1/0/all/0/1">B. J. LaMarr</a> (12), <a href="http://arxiv.org/find/astro-ph/1/au:+Lin_L/0/1/0/all/0/1">L. Lin</a> (13), <a href="http://arxiv.org/find/astro-ph/1/au:+Majid_W/0/1/0/all/0/1">W. Majid</a> (14), <a href="http://arxiv.org/find/astro-ph/1/au:+Okajima_T/0/1/0/all/0/1">T. Okajima</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Pope_J/0/1/0/all/0/1">J. Pope</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Ray_P/0/1/0/all/0/1">P. S. Ray</a> (15), <a href="http://arxiv.org/find/astro-ph/1/au:+Roberts_O/0/1/0/all/0/1">O. J. Roberts</a> (16), <a href="http://arxiv.org/find/astro-ph/1/au:+Saylor_M/0/1/0/all/0/1">M. Saylor</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Steiner_J/0/1/0/all/0/1">J. F. Steiner</a> (17), <a href="http://arxiv.org/find/astro-ph/1/au:+Wadiasingh_Z/0/1/0/all/0/1">Z. Wadiasingh</a> (4) ((1 and 2) GWU, (3) Rice University, (4) NASA/GSFC, (5) RIKEN research, (6) Noqsi Aerospace, (7) Sabanci University, (8) IRAP, (9) Istanbul University, (10) Haverford college, (11) Technical University, (12) MIT, (13) Normal University of Beijing, (14) JPL, (15) NRL, (16) Harvard)
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.
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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