GRB 180128A: A second magnetar giant flare candidate from the Sculptor Galaxy

Author:

Trigg Aaron C.ORCID,Burns EricORCID,Roberts Oliver J.ORCID,Negro MichelaORCID,Svinkin Dmitry S.ORCID,Baring Matthew G.ORCID,Wadiasingh ZorawarORCID,Christensen Nelson L.ORCID,Andreoni IgorORCID,Briggs Michael S.ORCID,Di Lalla NiccolòORCID,Frederiks Dmitry D.ORCID,Lipunov Vladimir M.ORCID,Omodei NicolaORCID,Ridnaia Anna V.ORCID,Veres PeterORCID,Lysenko Alexandra L.ORCID

Abstract

Magnetars are slowly rotating neutron stars that possess the strongest magnetic fields known in the cosmos (1014 − 1015 G). 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 energies Eiso ≈ 1044 − 1046 erg. Only seven MGF detections have been made 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 likely remain unidentified in archival data. We conducted a search of the Fermi Gamma-ray Burst Monitor 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 within NGC 253, commonly known as the Sculptor Galaxy. The event is the second MGF in modern astronomy to be associated with this galaxy and the first time two bursts have been 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 of an eighth identified MGF.

Funder

NASA

Department of Energy

Commissariat `a l’Energie Atomique

Centre National de la Recherche Scientifique / Institut National de Physique Nucl ́eaire et de Physique des Particules

Agenzia Spaziale Italiana

Istituto Nazionale di Fisica Nucleare

Ministry of Education, Culture, Sports, Science and Technology

High Energy Accelerator Research Organization

Japan Aerospace Exploration Agency

K. A. Wallenberg Foundation,

The Swedish Research Council

The Swedish National Space Board

Lomonosov MSU development program

Publisher

EDP Sciences

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Searching for pulsars, magnetars, and fast radio bursts in the sculptor galaxy using MeerKAT;Monthly Notices of the Royal Astronomical Society;2024-08-05

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