A magnetar powering the ordinary monster GRB 130427A?

M. G. Bernardini, S. Campana, G. Ghisellini, P. D'Avanzo, G. Calderone, S. Covino, G. Cusumano, G. Ghirlanda, V. L. Parola, A. Maselli, A. Melandri, R. Salvaterra, D. Burlon, V. D'Elia, D. Fugazza, Boris Sbarufatti, S. D. Vergani, G. Tagliaferri

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We present the analysis of the extraordinarily bright gamma-ray burst (GRB) 130427A under the hypothesis that the GRB central engine is an accretion-powered magnetar. In this framework, initially proposed to explain GRBs with precursor activity, the prompt emission is produced by accretion of matter on to a newly born magnetar, and the observed power is related to the accretion rate. The emission is eventually halted if the centrifugal forces are able to pause accretion. We show that the X-ray and optical afterglow is well explained as the forward shock emission with a jet break plus a contribution from the spin-down of the magnetar. Our modelling does not require any contribution from the reverse shock, that may still influence the afterglow light curve at radio and mm frequencies, or in the optical at early times. We derive the magnetic field (B ̃ 1016 G) and the spin period (P ̃ 20 ms) of the magnetar and obtain an independent estimate of the minimum luminosity for accretion. This minimum luminosity results well below the prompt emission luminosity of GRB 130427A, providing a strong consistency check for the scenario where the entire prompt emission is the result of continuous accretion on to the magnetar. This is in agreement with the relatively long spin period of the magnetar. GRB 130427A was a well-monitored GRB showing a very standard behaviour and, thus, is a well-suited benchmark to show that an accretion-powered magnetar gives a unique view of the properties of long GRBs.

Original languageEnglish (US)
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume439
Issue number1
DOIs
StatePublished - Mar 1 2014

Fingerprint

magnetars
gamma ray bursts
accretion
luminosity
afterglows
shock
centrifugal force
light curve
engines
engine
radio frequencies
radio
magnetic field
estimates
magnetic fields
modeling

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bernardini, M. G., Campana, S., Ghisellini, G., D'Avanzo, P., Calderone, G., Covino, S., ... Tagliaferri, G. (2014). A magnetar powering the ordinary monster GRB 130427A? Monthly Notices of the Royal Astronomical Society: Letters, 439(1). https://doi.org/10.1093/mnrasl/slu003
Bernardini, M. G. ; Campana, S. ; Ghisellini, G. ; D'Avanzo, P. ; Calderone, G. ; Covino, S. ; Cusumano, G. ; Ghirlanda, G. ; Parola, V. L. ; Maselli, A. ; Melandri, A. ; Salvaterra, R. ; Burlon, D. ; D'Elia, V. ; Fugazza, D. ; Sbarufatti, Boris ; Vergani, S. D. ; Tagliaferri, G. / A magnetar powering the ordinary monster GRB 130427A?. In: Monthly Notices of the Royal Astronomical Society: Letters. 2014 ; Vol. 439, No. 1.
@article{d6abc8399fdb48f19bbbaa6fe63455f2,
title = "A magnetar powering the ordinary monster GRB 130427A?",
abstract = "We present the analysis of the extraordinarily bright gamma-ray burst (GRB) 130427A under the hypothesis that the GRB central engine is an accretion-powered magnetar. In this framework, initially proposed to explain GRBs with precursor activity, the prompt emission is produced by accretion of matter on to a newly born magnetar, and the observed power is related to the accretion rate. The emission is eventually halted if the centrifugal forces are able to pause accretion. We show that the X-ray and optical afterglow is well explained as the forward shock emission with a jet break plus a contribution from the spin-down of the magnetar. Our modelling does not require any contribution from the reverse shock, that may still influence the afterglow light curve at radio and mm frequencies, or in the optical at early times. We derive the magnetic field (B ̃ 1016 G) and the spin period (P ̃ 20 ms) of the magnetar and obtain an independent estimate of the minimum luminosity for accretion. This minimum luminosity results well below the prompt emission luminosity of GRB 130427A, providing a strong consistency check for the scenario where the entire prompt emission is the result of continuous accretion on to the magnetar. This is in agreement with the relatively long spin period of the magnetar. GRB 130427A was a well-monitored GRB showing a very standard behaviour and, thus, is a well-suited benchmark to show that an accretion-powered magnetar gives a unique view of the properties of long GRBs.",
author = "Bernardini, {M. G.} and S. Campana and G. Ghisellini and P. D'Avanzo and G. Calderone and S. Covino and G. Cusumano and G. Ghirlanda and Parola, {V. L.} and A. Maselli and A. Melandri and R. Salvaterra and D. Burlon and V. D'Elia and D. Fugazza and Boris Sbarufatti and Vergani, {S. D.} and G. Tagliaferri",
year = "2014",
month = "3",
day = "1",
doi = "10.1093/mnrasl/slu003",
language = "English (US)",
volume = "439",
journal = "Monthly Notices of the Royal Astronomical Society: Letters",
issn = "1745-3925",
publisher = "Oxford University Press",
number = "1",

}

Bernardini, MG, Campana, S, Ghisellini, G, D'Avanzo, P, Calderone, G, Covino, S, Cusumano, G, Ghirlanda, G, Parola, VL, Maselli, A, Melandri, A, Salvaterra, R, Burlon, D, D'Elia, V, Fugazza, D, Sbarufatti, B, Vergani, SD & Tagliaferri, G 2014, 'A magnetar powering the ordinary monster GRB 130427A?', Monthly Notices of the Royal Astronomical Society: Letters, vol. 439, no. 1. https://doi.org/10.1093/mnrasl/slu003

A magnetar powering the ordinary monster GRB 130427A? / Bernardini, M. G.; Campana, S.; Ghisellini, G.; D'Avanzo, P.; Calderone, G.; Covino, S.; Cusumano, G.; Ghirlanda, G.; Parola, V. L.; Maselli, A.; Melandri, A.; Salvaterra, R.; Burlon, D.; D'Elia, V.; Fugazza, D.; Sbarufatti, Boris; Vergani, S. D.; Tagliaferri, G.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 439, No. 1, 01.03.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A magnetar powering the ordinary monster GRB 130427A?

AU - Bernardini, M. G.

AU - Campana, S.

AU - Ghisellini, G.

AU - D'Avanzo, P.

AU - Calderone, G.

AU - Covino, S.

AU - Cusumano, G.

AU - Ghirlanda, G.

AU - Parola, V. L.

AU - Maselli, A.

AU - Melandri, A.

AU - Salvaterra, R.

AU - Burlon, D.

AU - D'Elia, V.

AU - Fugazza, D.

AU - Sbarufatti, Boris

AU - Vergani, S. D.

AU - Tagliaferri, G.

PY - 2014/3/1

Y1 - 2014/3/1

N2 - We present the analysis of the extraordinarily bright gamma-ray burst (GRB) 130427A under the hypothesis that the GRB central engine is an accretion-powered magnetar. In this framework, initially proposed to explain GRBs with precursor activity, the prompt emission is produced by accretion of matter on to a newly born magnetar, and the observed power is related to the accretion rate. The emission is eventually halted if the centrifugal forces are able to pause accretion. We show that the X-ray and optical afterglow is well explained as the forward shock emission with a jet break plus a contribution from the spin-down of the magnetar. Our modelling does not require any contribution from the reverse shock, that may still influence the afterglow light curve at radio and mm frequencies, or in the optical at early times. We derive the magnetic field (B ̃ 1016 G) and the spin period (P ̃ 20 ms) of the magnetar and obtain an independent estimate of the minimum luminosity for accretion. This minimum luminosity results well below the prompt emission luminosity of GRB 130427A, providing a strong consistency check for the scenario where the entire prompt emission is the result of continuous accretion on to the magnetar. This is in agreement with the relatively long spin period of the magnetar. GRB 130427A was a well-monitored GRB showing a very standard behaviour and, thus, is a well-suited benchmark to show that an accretion-powered magnetar gives a unique view of the properties of long GRBs.

AB - We present the analysis of the extraordinarily bright gamma-ray burst (GRB) 130427A under the hypothesis that the GRB central engine is an accretion-powered magnetar. In this framework, initially proposed to explain GRBs with precursor activity, the prompt emission is produced by accretion of matter on to a newly born magnetar, and the observed power is related to the accretion rate. The emission is eventually halted if the centrifugal forces are able to pause accretion. We show that the X-ray and optical afterglow is well explained as the forward shock emission with a jet break plus a contribution from the spin-down of the magnetar. Our modelling does not require any contribution from the reverse shock, that may still influence the afterglow light curve at radio and mm frequencies, or in the optical at early times. We derive the magnetic field (B ̃ 1016 G) and the spin period (P ̃ 20 ms) of the magnetar and obtain an independent estimate of the minimum luminosity for accretion. This minimum luminosity results well below the prompt emission luminosity of GRB 130427A, providing a strong consistency check for the scenario where the entire prompt emission is the result of continuous accretion on to the magnetar. This is in agreement with the relatively long spin period of the magnetar. GRB 130427A was a well-monitored GRB showing a very standard behaviour and, thus, is a well-suited benchmark to show that an accretion-powered magnetar gives a unique view of the properties of long GRBs.

UR - http://www.scopus.com/inward/record.url?scp=84897784986&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897784986&partnerID=8YFLogxK

U2 - 10.1093/mnrasl/slu003

DO - 10.1093/mnrasl/slu003

M3 - Article

VL - 439

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

IS - 1

ER -

Bernardini MG, Campana S, Ghisellini G, D'Avanzo P, Calderone G, Covino S et al. A magnetar powering the ordinary monster GRB 130427A? Monthly Notices of the Royal Astronomical Society: Letters. 2014 Mar 1;439(1). https://doi.org/10.1093/mnrasl/slu003