Polarimetric Constraints on the Optical Afterglow Emission from GRB 990123-Reference-Cited by-同舟云学术

Polarimetric Constraints on the Optical Afterglow Emission from GRB 990123

Published:1999-03-26 Issue:5410 Volume:283 Page:2073-2075
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Hjorth Jens¹,Björnsson Gunnlaugur²,Andersen Michael I.³,Caon Nicola⁴,Cairós Luz Marina⁴,Castro-Tirado Alberto J.⁵⁶,Osorio Marı́a Rosa Zapatero⁴,Pedersen Holger¹,Costa Enrico⁷

Affiliation:

1. Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark.

2. Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland.

3. Nordic Optical Telescope, Ap. 474 St. Cruz de La Palma, E-38700 Canarias, Spain.

4. Instituto de Astrofı́sica de Canarias, E-38200 La Laguna, Tenerife, Spain.

5. Laboratorio de Astrofı́sica Espacial y Fı́sica Fundamental, Instituto Nacional de Técnica Aeroespacial, P.O. Box 50727, E-28080 Madrid, Spain.

6. Instituto de Astrofı́sica de Andalucı́a, Consejo Superior de Investigaciones Cientı́ficas, P.O. Box 03004, E-18080 Granada, Spain.

7. Istituto di Astrofisica Spaziale–C.N.R., Via Fosso del Cavaliere, I-00133 Rome, Italy.

Abstract

Polarization of the optical emission from GRB 990123 was measured on 24.17 January 1999 universal time with the Nordic Optical Telescope. An upper limit of 2.3% on the linear polarization was found. Accurate polarization measurements provide important clues to the blast wave geometry and magnetic field structure of gamma-ray bursts (GRBs). The lack of detectable polarization for GRB 990123 indicates that the optical afterglow was produced by a blast wave of unknown geometry with an insignificant coherent magnetic field or by a beamed outflow at high Lorentz factor seen at a small viewing angle. Such a collimated jet would help solve the problem of energy release in this exceptionally luminous cosmological burst.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference42 articles.

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4. S. C. Odewahn J. S. Bloom S. R. Kulkarni GCN Circular 201 (1999); IAU Circular 7094 (1999).

5. Decay of the GRB 990123 Optical Afterglow: Implications for the Fireball Model

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