Jet breaks in short gamma-ray bursts. II. The collimated afterglow of GRB 051221A

David N. Burrows, Dirk Grupe, Milvia Capalbi, Alin Panaitescu, Sandeep K. Patel, Chryssa Kouveliotou, Bing Zhang, Peter Mészáros, Guido Chincarini, Neil Gehrels, Ralph A.M. Wijers

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

We report the best evidence to date of a jet break in a short gamma-ray burst (GRB) afterglow, using Chandra and Swift XRT observations of the X-ray afterglow of GRB 051221 A. The combined X-ray light curve, which has three breaks, is similar to those commonly observed in Swift observations of long GRBs. A flat segment of the light curve at ∼0.1 days after the burst represents the first clear case of strong energy injection in the external shock of a short GRB afterglow. The last break in the light curve occurs at ∼4 days postburst and breaks to a power-law decay index of ∼2. We interpret this as a jet break, with important implications for models of short GRBs, since it requires collimation of the afterglow into a jet with an initial opening angle 00 ∼ 4°-8° and implies a total jet kinetic energy of E jet ∼ (1-5) × 1049 ergs. Combined with the lack of a jet break in GRB 050724, this suggests a wide range in jet collimation in short GRBs, with at least some having collimation similar to that found in long GRBs, although with significantly lower jet energies.

Original languageEnglish (US)
Pages (from-to)468-473
Number of pages6
JournalAstrophysical Journal
Volume653
Issue number1 I
DOIs
StatePublished - Dec 10 2006

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afterglows
gamma ray bursts
collimation
light curve
erg
kinetic energy
energy
bursts
power law
x rays
shock
injection
decay

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Burrows, D. N., Grupe, D., Capalbi, M., Panaitescu, A., Patel, S. K., Kouveliotou, C., ... Wijers, R. A. M. (2006). Jet breaks in short gamma-ray bursts. II. The collimated afterglow of GRB 051221A. Astrophysical Journal, 653(1 I), 468-473. https://doi.org/10.1086/508740
Burrows, David N. ; Grupe, Dirk ; Capalbi, Milvia ; Panaitescu, Alin ; Patel, Sandeep K. ; Kouveliotou, Chryssa ; Zhang, Bing ; Mészáros, Peter ; Chincarini, Guido ; Gehrels, Neil ; Wijers, Ralph A.M. / Jet breaks in short gamma-ray bursts. II. The collimated afterglow of GRB 051221A. In: Astrophysical Journal. 2006 ; Vol. 653, No. 1 I. pp. 468-473.
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Burrows, DN, Grupe, D, Capalbi, M, Panaitescu, A, Patel, SK, Kouveliotou, C, Zhang, B, Mészáros, P, Chincarini, G, Gehrels, N & Wijers, RAM 2006, 'Jet breaks in short gamma-ray bursts. II. The collimated afterglow of GRB 051221A', Astrophysical Journal, vol. 653, no. 1 I, pp. 468-473. https://doi.org/10.1086/508740

Jet breaks in short gamma-ray bursts. II. The collimated afterglow of GRB 051221A. / Burrows, David N.; Grupe, Dirk; Capalbi, Milvia; Panaitescu, Alin; Patel, Sandeep K.; Kouveliotou, Chryssa; Zhang, Bing; Mészáros, Peter; Chincarini, Guido; Gehrels, Neil; Wijers, Ralph A.M.

In: Astrophysical Journal, Vol. 653, No. 1 I, 10.12.2006, p. 468-473.

Research output: Contribution to journalArticle

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T1 - Jet breaks in short gamma-ray bursts. II. The collimated afterglow of GRB 051221A

AU - Burrows, David N.

AU - Grupe, Dirk

AU - Capalbi, Milvia

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AU - Patel, Sandeep K.

AU - Kouveliotou, Chryssa

AU - Zhang, Bing

AU - Mészáros, Peter

AU - Chincarini, Guido

AU - Gehrels, Neil

AU - Wijers, Ralph A.M.

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N2 - We report the best evidence to date of a jet break in a short gamma-ray burst (GRB) afterglow, using Chandra and Swift XRT observations of the X-ray afterglow of GRB 051221 A. The combined X-ray light curve, which has three breaks, is similar to those commonly observed in Swift observations of long GRBs. A flat segment of the light curve at ∼0.1 days after the burst represents the first clear case of strong energy injection in the external shock of a short GRB afterglow. The last break in the light curve occurs at ∼4 days postburst and breaks to a power-law decay index of ∼2. We interpret this as a jet break, with important implications for models of short GRBs, since it requires collimation of the afterglow into a jet with an initial opening angle 00 ∼ 4°-8° and implies a total jet kinetic energy of E jet ∼ (1-5) × 1049 ergs. Combined with the lack of a jet break in GRB 050724, this suggests a wide range in jet collimation in short GRBs, with at least some having collimation similar to that found in long GRBs, although with significantly lower jet energies.

AB - We report the best evidence to date of a jet break in a short gamma-ray burst (GRB) afterglow, using Chandra and Swift XRT observations of the X-ray afterglow of GRB 051221 A. The combined X-ray light curve, which has three breaks, is similar to those commonly observed in Swift observations of long GRBs. A flat segment of the light curve at ∼0.1 days after the burst represents the first clear case of strong energy injection in the external shock of a short GRB afterglow. The last break in the light curve occurs at ∼4 days postburst and breaks to a power-law decay index of ∼2. We interpret this as a jet break, with important implications for models of short GRBs, since it requires collimation of the afterglow into a jet with an initial opening angle 00 ∼ 4°-8° and implies a total jet kinetic energy of E jet ∼ (1-5) × 1049 ergs. Combined with the lack of a jet break in GRB 050724, this suggests a wide range in jet collimation in short GRBs, with at least some having collimation similar to that found in long GRBs, although with significantly lower jet energies.

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Burrows DN, Grupe D, Capalbi M, Panaitescu A, Patel SK, Kouveliotou C et al. Jet breaks in short gamma-ray bursts. II. The collimated afterglow of GRB 051221A. Astrophysical Journal. 2006 Dec 10;653(1 I):468-473. https://doi.org/10.1086/508740