Optical and radio observations of the afterglow from GRB 990510: Evidence for a jet

F. A. Harrison; J. S. Bloom; D. A. Frail; R. Sari; S. R. Kulkarni; S. G. Djorgovski; T. Axelrod; J. Mould; B. P. Schmidt; M. H. Wieringa; R. M. Wark; R. Subrahmanyan; D. McConnell; P. J. McCarthy; B. E. Schaefer; R. G. McMahon; R. O. Markze; E. Firth; P. Soffitta; L. Amati

doi:10.1086/312282

Optical and radio observations of the afterglow from GRB 990510: Evidence for a jet

F. A. Harrison^*, J. S. Bloom, D. A. Frail, R. Sari, S. R. Kulkarni, S. G. Djorgovski, T. Axelrod, J. Mould, B. P. Schmidt, M. H. Wieringa, R. M. Wark, R. Subrahmanyan, D. McConnell, P. J. McCarthy, B. E. Schaefer, R. G. McMahon, R. O. Markze, E. Firth, P. Soffitta, L. Amati

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

We present multicolor optical and two-frequency radio observations of the bright BeppoSAX event GRB 990510. Neither the well-sampled optical decay nor the radio observations are consistent with simple spherical afterglow models. The achromatic steepening in the optical band and the early decay of the radio afterglow, which both occur at t ∼ 1 day, are evidence for hydrodynamical evolution of the source and can be most easily interpreted by models in which the gamma-ray burst ejecta are collimated in a jet. Employing a simple jet model to explain the observations, we derive a jet opening angle of θ₀ = 0.08(n/l cm^-3)^1/8, reducing the isotropic gamma-ray energy release of 2.9 × 10⁵³ ergs by a factor of ∼300.

Original language	English
Pages (from-to)	L121-L124
Journal	Astrophysical Journal
Volume	523
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/312282
State	Published - 1 Oct 1999
Externally published	Yes

Bibliographical note

Funding Information:
We thank Scott Barthelmy for operating the GCN, the staffs of LCO, MSSSO, and ATCA, and the entire BeppoSAX team. This work was supported by grants from NSF (S. R. K. and S. G. D.), NASA (F. A. H. and S. R. K.), and the Bressler Foundation (S. G. D.).

Keywords

Cosmology: miscellaneous
Gamma rays: bursts
Radio continuum: general
Shock waves

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Harrison, F. A., Bloom, J. S., Frail, D. A., Sari, R., Kulkarni, S. R., Djorgovski, S. G., Axelrod, T., Mould, J., Schmidt, B. P., Wieringa, M. H., Wark, R. M., Subrahmanyan, R., McConnell, D., McCarthy, P. J., Schaefer, B. E., McMahon, R. G., Markze, R. O., Firth, E., Soffitta, P., & Amati, L. (1999). Optical and radio observations of the afterglow from GRB 990510: Evidence for a jet. Astrophysical Journal, 523(2 PART 2), L121-L124. https://doi.org/10.1086/312282

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title = "Optical and radio observations of the afterglow from GRB 990510: Evidence for a jet",

abstract = "We present multicolor optical and two-frequency radio observations of the bright BeppoSAX event GRB 990510. Neither the well-sampled optical decay nor the radio observations are consistent with simple spherical afterglow models. The achromatic steepening in the optical band and the early decay of the radio afterglow, which both occur at t ∼ 1 day, are evidence for hydrodynamical evolution of the source and can be most easily interpreted by models in which the gamma-ray burst ejecta are collimated in a jet. Employing a simple jet model to explain the observations, we derive a jet opening angle of θ0 = 0.08(n/l cm-3)1/8, reducing the isotropic gamma-ray energy release of 2.9 × 1053 ergs by a factor of ∼300.",

keywords = "Cosmology: miscellaneous, Gamma rays: bursts, Radio continuum: general, Shock waves",

author = "Harrison, {F. A.} and Bloom, {J. S.} and Frail, {D. A.} and R. Sari and Kulkarni, {S. R.} and Djorgovski, {S. G.} and T. Axelrod and J. Mould and Schmidt, {B. P.} and Wieringa, {M. H.} and Wark, {R. M.} and R. Subrahmanyan and D. McConnell and McCarthy, {P. J.} and Schaefer, {B. E.} and McMahon, {R. G.} and Markze, {R. O.} and E. Firth and P. Soffitta and L. Amati",

note = "Funding Information: We thank Scott Barthelmy for operating the GCN, the staffs of LCO, MSSSO, and ATCA, and the entire BeppoSAX team. This work was supported by grants from NSF (S. R. K. and S. G. D.), NASA (F. A. H. and S. R. K.), and the Bressler Foundation (S. G. D.).",

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Harrison, FA, Bloom, JS, Frail, DA, Sari, R, Kulkarni, SR, Djorgovski, SG, Axelrod, T, Mould, J, Schmidt, BP, Wieringa, MH, Wark, RM, Subrahmanyan, R, McConnell, D, McCarthy, PJ, Schaefer, BE, McMahon, RG, Markze, RO, Firth, E, Soffitta, P & Amati, L 1999, 'Optical and radio observations of the afterglow from GRB 990510: Evidence for a jet', Astrophysical Journal, vol. 523, no. 2 PART 2, pp. L121-L124. https://doi.org/10.1086/312282

TY - JOUR

T1 - Optical and radio observations of the afterglow from GRB 990510

T2 - Evidence for a jet

AU - Harrison, F. A.

AU - Bloom, J. S.

AU - Frail, D. A.

AU - Sari, R.

AU - Kulkarni, S. R.

AU - Djorgovski, S. G.

AU - Axelrod, T.

AU - Mould, J.

AU - Schmidt, B. P.

AU - Wieringa, M. H.

AU - Wark, R. M.

AU - Subrahmanyan, R.

AU - McConnell, D.

AU - McCarthy, P. J.

AU - Schaefer, B. E.

AU - McMahon, R. G.

AU - Markze, R. O.

AU - Firth, E.

AU - Soffitta, P.

AU - Amati, L.

N1 - Funding Information: We thank Scott Barthelmy for operating the GCN, the staffs of LCO, MSSSO, and ATCA, and the entire BeppoSAX team. This work was supported by grants from NSF (S. R. K. and S. G. D.), NASA (F. A. H. and S. R. K.), and the Bressler Foundation (S. G. D.).

PY - 1999/10/1

Y1 - 1999/10/1

N2 - We present multicolor optical and two-frequency radio observations of the bright BeppoSAX event GRB 990510. Neither the well-sampled optical decay nor the radio observations are consistent with simple spherical afterglow models. The achromatic steepening in the optical band and the early decay of the radio afterglow, which both occur at t ∼ 1 day, are evidence for hydrodynamical evolution of the source and can be most easily interpreted by models in which the gamma-ray burst ejecta are collimated in a jet. Employing a simple jet model to explain the observations, we derive a jet opening angle of θ0 = 0.08(n/l cm-3)1/8, reducing the isotropic gamma-ray energy release of 2.9 × 1053 ergs by a factor of ∼300.

AB - We present multicolor optical and two-frequency radio observations of the bright BeppoSAX event GRB 990510. Neither the well-sampled optical decay nor the radio observations are consistent with simple spherical afterglow models. The achromatic steepening in the optical band and the early decay of the radio afterglow, which both occur at t ∼ 1 day, are evidence for hydrodynamical evolution of the source and can be most easily interpreted by models in which the gamma-ray burst ejecta are collimated in a jet. Employing a simple jet model to explain the observations, we derive a jet opening angle of θ0 = 0.08(n/l cm-3)1/8, reducing the isotropic gamma-ray energy release of 2.9 × 1053 ergs by a factor of ∼300.

KW - Cosmology: miscellaneous

KW - Gamma rays: bursts

KW - Radio continuum: general

KW - Shock waves

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DO - 10.1086/312282

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AN - SCOPUS:0033449880

SN - 0004-637X

VL - 523

SP - L121-L124

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

ER -

Optical and radio observations of the afterglow from GRB 990510: Evidence for a jet

Abstract

Bibliographical note

Keywords

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