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Pré-Publication, Document De Travail Année : 2023

GRB 180128A: A Second Magnetar Giant Flare Candidate from the Sculptor Galaxy

Aaron C Trigg
  • Fonction : Auteur
Eric Burns
  • Fonction : Auteur
Oliver J Roberts
  • Fonction : Auteur
Michela Negro
  • Fonction : Auteur
Dmitry S Svinkin
  • Fonction : Auteur
Matthew G Baring
  • Fonction : Auteur
Zorawar Wadiasingh
  • Fonction : Auteur
Igor Andreoni
  • Fonction : Auteur
Michael S Briggs
  • Fonction : Auteur
Niccolo Di Lalla
  • Fonction : Auteur
Dmitry D Frederiks
  • Fonction : Auteur
Vladimir M Lipunov
  • Fonction : Auteur
Nicola Omodei
  • Fonction : Auteur
Anna V Ridnaia
  • Fonction : Auteur
Peter Veres
  • Fonction : Auteur
Alexandra L Lysenko
  • Fonction : Auteur

Résumé

Magnetars are slowly rotating neutron stars that possess the strongest magnetic fields ($10^{14}-10^{15} \mathrm{G}$) known in the cosmos. They display a range of transient high-energy electromagnetic activity. The brightest and most energetic of these events are the gamma-ray bursts (GRBs) known as magnetar giant flares (MGFs), with isotropic energy $E\approx10^{44}-10^{46} \mathrm{erg}$. There are only seven detections identified as MGFs to date: three unambiguous events occurred in our Galaxy and the Magellanic Clouds, and the other four MGF candidates are associated with nearby star-forming galaxies. As all seven identified MGFs are bright at Earth, additional weaker events remain unidentified in archival data. We conducted a search of the Fermi Gamma-ray Burst Monitor (GBM) database for candidate extragalactic MGFs and, when possible, collected localization data from the Interplanetary Network (IPN) satellites. Our search yielded one convincing event, GRB 180128A. IPN localizes this burst with NGC 253, commonly known as the Sculptor Galaxy. This event is the second MGF in modern astronomy to be associated with this galaxy and the first time two bursts are associated with a single galaxy outside our own. Here, we detail the archival search criteria that uncovered this event and its spectral and temporal properties, which are consistent with expectations for a MGF. We also discuss the theoretical implications and finer burst structures resolved from various binning methods. Our analysis provides observational evidence for an eighth identified MGF.

Dates et versions

hal-04324085 , version 1 (05-12-2023)

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Citer

Aaron C Trigg, Eric Burns, Oliver J Roberts, Michela Negro, Dmitry S Svinkin, et al.. GRB 180128A: A Second Magnetar Giant Flare Candidate from the Sculptor Galaxy. 2023. ⟨hal-04324085⟩
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