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

Published online by Cambridge University Press:  27 February 2023

Michela Negro Open the ORCID record for Michela Negro [Opens in a new window]  and
Eric Burns
Michela Negro
Affiliation:
University of Maryland, Baltimore County, Baltimore, MD 21250, USA NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA CRESST, NASA/GSFC, Greenbelt, MD 20771, US email: [email protected]
Eric Burns
Affiliation:
Louisiana State University: Baton Rouge, LA, US email: [email protected]
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Abstract

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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 $$R{\rm{ = }}3.8_{ - 3.1}^{ + 4.0} \times {10^5}Gp{c^{ - 3}}y{r^{ - 1}}$$. 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.

Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S363: Neutron Star Astrophysics at the Crossroads: Magnetars and the Multimessenger Revolution , June 2020 , pp. 284 - 287
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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