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Article Dans Une Revue Astrophys.J.Lett. Année : 2021

Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin

E. Burns
  • Fonction : Auteur
D. Svinkin
  • Fonction : Auteur
K. Hurley
  • Fonction : Auteur
Z. Wadiasingh
M. Negro
  • Fonction : Auteur
G. Younes
  • Fonction : Auteur
R. Hamburg
  • Fonction : Auteur
A. Ridnaia
  • Fonction : Auteur
D. Cook
  • Fonction : Auteur
S.B. Cenko
  • Fonction : Auteur
R. Aloisi
  • Fonction : Auteur
G. Ashton
  • Fonction : Auteur
M. Baring
  • Fonction : Auteur
M.S. Briggs
  • Fonction : Auteur
D. Frederiks
  • Fonction : Auteur
A. Goldstein
  • Fonction : Auteur
C.M. Hui
  • Fonction : Auteur
D.L. Kaplan
  • Fonction : Auteur
M.M. Kasliwal
  • Fonction : Auteur
D. Kocevski
  • Fonction : Auteur
O.J. Roberts
  • Fonction : Auteur
V. Savchenko
  • Fonction : Auteur
A. Tohuvavohu
  • Fonction : Auteur
P. Veres
C.A. Wilson-Hodge
  • Fonction : Auteur

Résumé

Cosmological gamma-ray bursts (GRBs) are known to arise from distinct progenitor channels: short GRBs mostly from neutron star mergers and long GRBs from a rare type of core-collapse supernova (CCSN) called collapsars. Highly magnetized neutron stars called magnetars also generate energetic, short-duration gamma-ray transients called magnetar giant flares (MGFs). Three have been observed from the Milky Way and its satellite galaxies, and they have long been suspected to constitute a third class of extragalactic GRBs. We report the unambiguous identification of a distinct population of four local (<5 Mpc) short GRBs, adding GRB 070222 to previously discussed events. While identified solely based on alignment with nearby star-forming galaxies, their rise time and isotropic energy release are independently inconsistent with the larger short GRB population at >99.9% confidence. These properties, the host galaxies, and nondetection in gravitational waves all point to an extragalactic MGF origin. Despite the small sample, the inferred volumetric rates for events above 4 × 1044 erg of Gpc−3 yr−1 make MGFs the dominant gamma-ray transient detected from extragalactic sources. As previously suggested, these rates imply that some magnetars produce multiple MGFs, providing a source of repeating GRBs. The rates and host galaxies favor common CCSN as key progenitors of magnetars.

Dates et versions

hal-03129484 , version 1 (02-02-2021)

Identifiants

Citer

E. Burns, D. Svinkin, K. Hurley, Z. Wadiasingh, M. Negro, et al.. Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin. Astrophys.J.Lett., 2021, 907 (2), pp.L28. ⟨10.3847/2041-8213/abd8c8⟩. ⟨hal-03129484⟩
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