The DOI matches its Crossref record; 21 of the 21 references it cites were found in a registry or an index.
The Dynamics and Light Curves of Beamed Gamma‐Ray Burst Afterglows
Open accessAbstract
The energy requirements of gamma-ray bursts have in past been poorly constrained because of three major uncertainties: the distances to bursts, the degree of burst beaming, and the efficiency of gamma-ray production. The first of these has been resolved, with both indirect evidence (the distribution of bursts in flux and position) and direct evidence (redshifted absorption features in the afterglow spectrum of GRB 970508) pointing to cosmological distances. We now wish to address the second uncertainty. Afterglows allow a statistical test of beaming, described in an earlier paper. In this paper, we modify a standard fireball afterglow model to explore the effects of beaming on burst remnant dynamics and afterglow emission. If the burst ejecta are beamed into angle ζ m , the burst remnant's evolution changes qualitatively once its bulk Lorentz factor Γ ≲ 1/ζ m : before this, Γ declines as a power law of radius, while afterward, it declines exponentially. This change results in a broken power-law light curve whose late-time decay is faster than expected for a purely spherical geometry. These predictions disagree with afterglow observations of GRB 970508. We explored several variations on our model, but none seems to be able to change this result. We therefore suggest that this burst is unlikely to have been highly beamed and that its energy requirements were near those of isotropic models. More recent afterglows may offer the first practical applications for our beamed models.
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Cites
Radiative processes in astrophysics
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Spectra and Light Curves of Gamma-Ray Burst Afterglows
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Spectra and Light Curves of Gamma-Ray Burst AfterglowsPreprint
Sari, R., Piran, T., & Narayan, R. (1997) · Cited by 1,385
Optical and Long‐Wavelength Afterglow from Gamma‐Ray Bursts
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Transient optical emission from the error box of the γ-ray burst of 28 February 1997
van Paradijs, J., Groot, P. J., Galama, T., Kouveliotou, C., Strom, R. G., Telting, J., Rutten, R. G. M., Fishman, G. J., Meegan, C. A., Pettini, M., et al. (1997) · Nature · doi:10.1038/386686a0 · Cited by 917
Are gamma-ray bursts optically thick?
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Cited by
Zhang, B., Fan, Y. Z., Dyks, J., Kobayashi, S., Meszaros, P., Burrows, D. N., Nousek, J. A., & Gehrels, N. (2006) · The Astrophysical Journal · doi:10.1086/500723 · Cited by 1,079
“The jet model (e.g., Rhoads 1999; Sari et al. 1999).”
BackgroundMethodGAMMA-RAY BURSTS: PROGRESS, PROBLEMS & PROSPECTS
ZHANG, B., & MÉSZÁROS, P. (2004) · International Journal of Modern Physics A · doi:10.1142/s0217751x0401746x · Cited by 783
Gamma-Ray Bursts in the Swift Era
Gehrels, N., Ramirez-Ruiz, E., & Fox, D. B. (2009) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.46.060407.145147 · Cited by 615
JET BREAKS AND ENERGETICS OF Swift GAMMA-RAY BURST X-RAY AFTERGLOWS
Racusin, J. L., Liang, E. W., Burrows, D. N., Falcone, A., Sakamoto, T., Zhang, B. B., Zhang, B., Evans, P., & Osborne, J. (2009) · The Astrophysical Journal · doi:10.1088/0004-637x/698/1/43 · Cited by 310
Swift Observations of GRB 070110: An Extraordinary X‐Ray Afterglow Powered by the Central Engine
Troja, E., Cusumano, G., O’Brien, P. T., Zhang, B., Sbarufatti, B., Mangano, V., Willingale, R., Chincarini, G., Osborne, J. P., Marshall, F. E., et al. (2007) · The Astrophysical Journal · doi:10.1086/519450 · Cited by 305
Metadata
- Authors
- Rhoads, J. E.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1999-11-10
- Volume
- 525
- Issue
- 2
- Pages
- 737-749
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1992020520
- Cited by
- 787
- References
- 21
- FWCI
- 34.20
- Type
- journal article
- Language
- en
- Open access
- bronze
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