Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin
Document Type
Conference Proceeding
Publication Date
6-18-2020
Abstract
Triggered by the MGF detected from the Sculptor galaxy on April 2020, the study described in this proceeding reports the unambiguous identification of a distinct population of 4 local (< 5 Mpc) short GRBs, whose 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. The inferred volumetric rates for events above 4 × 1044 erg of. These rates imply that some magnetars produce multiple MGFs, providing a source of repeating GRBs. The rates and host galaxies favor common core-collapse supernova as key progenitors of magnetars.
Publication Source (Journal or Book title)
Proceedings of the International Astronomical Union
First Page
284
Last Page
287
Recommended Citation
Negro, M., & Burns, E. (2020). Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin. Proceedings of the International Astronomical Union, 16, 284-287. https://doi.org/10.1017/S1743921322001107