English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present the analysis of the extraordinarily bright Gamma-Ray Burst (GRB)130427A under the hypothesis that the GRB central engine is anaccretion-powered magnetar. In this framework, initially proposed to explainGRBs with precursor activity, the prompt emission is produced by accretion ofmatter onto a newly-born magnetar, and the observed power is related to theaccretion rate. The emission is eventually halted if the centrifugal forces areable to pause accretion. We show that the X-ray and optical afterglow is wellexplained as the forward shock emission with a jet break plus a contributionfrom the spin-down of the magnetar. Our modelling does not require anycontribution from the reverse shock, that may still influence the afterglowlight curve at radio and mm frequencies, or in the optical at early times. Wederive the magnetic field ($B\sim 10^{16}$ G) and the spin period ($P\sim 20$ms) of the magnetar and obtain an independent estimate of the minimumluminosity for accretion. This minimum luminosity results well below the promptemission luminosity of GRB 130427A, providing a strong consistency check forthe scenario where the entire prompt emission is the result of continuousaccretion onto the magnetar. This is in agreement with the relatively long spinperiod of the magnetar. GRB 130427A was a well monitored GRB showing a verystandard behavior and, thus, is a well-suited benchmark to show that anaccretion-powered magnetar gives a unique view of the properties of long GRBs.

A magnetar powering the ordinary monster GRB 130427A?