تقرير
Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin
| العنوان: | Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin |
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| المؤلفون: | E Burns, D Svinkin, K Hurley, Z Wadiasingh, M Negro, G Younes, R Hamburg, A Ridnaia, D Cook, S B Cenko, R Aloisi, G Ashton, M Baring, M S Briggs, N Christensen, D Frederiks, A Goldstein, C M Hui, D L Kaplan, M M Kasliwal, D Kocevski, O J Roberts, V Savchenko, A Tohuvavohu, P Veres, C A Wilson-Hodge |
| المصدر: | Astrophysical Journal Letters. 907(2) |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Astronomy |
| الوصف: | 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 non-detection in gravitational waves all point to an extragalactic MGF origin. Despite the small sample, the inferred volumetric rates for events above 4 × 10(exp 44) erg of R(sub MGF) =3.8(sup +4.0)(sub -3.1) ×10(exp 5) Gpc(exp -3) yr(exp -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. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 2041-8213 2041-8205 |
| DOI: | 10.3847/2041-8213/abd8c8 |
| URL الوصول: | https://ntrs.nasa.gov/citations/20210017372 |
| ملاحظات: | 789737 |
| رقم الأكسشن: | edsnas.20210017372 |
| قاعدة البيانات: | NASA Technical Reports |
| تدمد: | 20418213 20418205 |
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| DOI: | 10.3847/2041-8213/abd8c8 |