Short GRB 130603B

Discovery of a jet break in the optical and radio afterglows, and a mysterious late-time X-ray excess

W. Fong, E. Berger, B. D. Metzger, R. Margutti, R. Chornock, G. Migliori, R. J. Foley, B. A. Zauderer, R. Lunnan, T. Laskar, Steven Desch, K. J. Meech, S. Sonnett, C. Dickey, A. Hedlund, P. Harding

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

We present radio, optical/NIR, and X-ray observations of the afterglow of the short-duration Swift and Konus-Wind GRB 130603B, and uncover a break in the radio and optical bands at ∼0.5 day after the burst, best explained as a jet break with an inferred jet opening angle of ∼4°-8°. GRB 130603B is only the third short GRB with a radio afterglow detection to date, and represents the first time that a jet break has been evident in the radio band. We model the temporal evolution of the spectral energy distribution to determine the burst explosion properties and find an isotropic-equivalent kinetic energy of ∼(0.6-1.7) × 1051 erg and a circumburst density of ∼5 × 10-3-30 cm-3. From the inferred opening angle of GRB 130603B, we calculate beaming-corrected energies of E γ ∼ (0.5-2) × 1049 erg and E K ∼ (0.1-1.6) × 1049 erg. Along with previous measurements and lower limits we find a median opening angle of ∼10°. Using the all-sky observed rate of 10 Gpc-3 yr-1, this implies a true short GRB rate of ∼20 yr-1 within 200 Mpc, the Advanced LIGO/VIRGO sensitivity range for neutron star binary mergers. Finally, we uncover evidence for significant excess emission in the X-ray afterglow of GRB 130603B at ≳ 1 day and conclude that the additional energy component could be due to fall-back accretion or spin-down energy from a magnetar formed following the merger.

Original languageEnglish (US)
Article number118
JournalAstrophysical Journal
Volume780
Issue number2
DOIs
StatePublished - Jan 10 2014

Fingerprint

afterglows
erg
radio
bursts
merger
energy
magnetars
LIGO (observatory)
x rays
spectral energy distribution
neutron stars
explosions
sky
temporal evolution
kinetic energy
explosion
sensitivity
accretion
rate

Keywords

  • gamma-ray burst: individual (130603B)

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Fong, W., Berger, E., Metzger, B. D., Margutti, R., Chornock, R., Migliori, G., ... Harding, P. (2014). Short GRB 130603B: Discovery of a jet break in the optical and radio afterglows, and a mysterious late-time X-ray excess. Astrophysical Journal, 780(2), [118]. https://doi.org/10.1088/0004-637X/780/2/118

Short GRB 130603B : Discovery of a jet break in the optical and radio afterglows, and a mysterious late-time X-ray excess. / Fong, W.; Berger, E.; Metzger, B. D.; Margutti, R.; Chornock, R.; Migliori, G.; Foley, R. J.; Zauderer, B. A.; Lunnan, R.; Laskar, T.; Desch, Steven; Meech, K. J.; Sonnett, S.; Dickey, C.; Hedlund, A.; Harding, P.

In: Astrophysical Journal, Vol. 780, No. 2, 118, 10.01.2014.

Research output: Contribution to journalArticle

Fong, W, Berger, E, Metzger, BD, Margutti, R, Chornock, R, Migliori, G, Foley, RJ, Zauderer, BA, Lunnan, R, Laskar, T, Desch, S, Meech, KJ, Sonnett, S, Dickey, C, Hedlund, A & Harding, P 2014, 'Short GRB 130603B: Discovery of a jet break in the optical and radio afterglows, and a mysterious late-time X-ray excess', Astrophysical Journal, vol. 780, no. 2, 118. https://doi.org/10.1088/0004-637X/780/2/118
Fong, W. ; Berger, E. ; Metzger, B. D. ; Margutti, R. ; Chornock, R. ; Migliori, G. ; Foley, R. J. ; Zauderer, B. A. ; Lunnan, R. ; Laskar, T. ; Desch, Steven ; Meech, K. J. ; Sonnett, S. ; Dickey, C. ; Hedlund, A. ; Harding, P. / Short GRB 130603B : Discovery of a jet break in the optical and radio afterglows, and a mysterious late-time X-ray excess. In: Astrophysical Journal. 2014 ; Vol. 780, No. 2.
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