Title

GRB 200415A: A Short Gamma-Ray Burst from a Magnetar Giant Flare?

Document Type

Article

Publication Date

8-18-2020

Publication Title

The Astrophysical Journal Letters

Volume

899

Issue

2

First page number:

1

Last page number:

11

Abstract

The giant flares of soft gamma-ray repeaters (SGRs) have long been proposed to contribute to at least a subsample of the observed short gamma-ray bursts (GRBs). In this paper, we perform a comprehensive analysis of the highenergy data of the recent bright short GRB 200415A, which was located close to the Sculptor galaxy. Our results suggest that a magnetar giant flare provides the most natural explanation for most observational properties of GRB 200415A, including its location, temporal and spectral features, energy, statistical correlations, and high-energy emissions. On the other hand, the compact star merger GRB model is found to have difficulty reproducing such an event in a nearby distance. Future detections and follow-up observations of similar events are essential to firmly establish the connection between SGR giant flares and a subsample of nearby short GRBs.

Keywords

Gamma-Ray Bursts; Soft Gamma-Ray Repeaters; Magnetars; Gamma-Ray Transient Sources

Disciplines

Astrophysics and Astronomy | Physical Sciences and Mathematics | Stars, Interstellar Medium and the Galaxy

Language

English

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