Early Optical Polarization of a Gamma-Ray Burst Afterglow-Reference-Cited by-同舟云学术

Early Optical Polarization of a Gamma-Ray Burst Afterglow

Published:2007-03-30 Issue:5820 Volume:315 Page:1822-1824
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Mundell Carole G.¹²³⁴⁵,Steele Iain A.¹²³⁴⁵,Smith Robert J.¹²³⁴⁵,Kobayashi Shiho¹²³⁴⁵,Melandri Andrea¹²³⁴⁵,Guidorzi Cristiano¹²³⁴⁵,Gomboc Andreja¹²³⁴⁵,Mottram Chris J.¹²³⁴⁵,Clarke David¹²³⁴⁵,Monfardini Alessandro¹²³⁴⁵,Carter David¹²³⁴⁵,Bersier David¹²³⁴⁵

Affiliation:

1. Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead, CH41 1LD, UK.

2. Dipartimento di Fisica, Universitá di Milano-Bicocca, Piazza delle Scienze 3, 20126 Milano, Italy.

3. Istituto Nazionale di Astrofisica-Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (LC), Italy.

4. Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia.

5. Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK.

Abstract

We report the optical polarization of a gamma-ray burst (GRB) afterglow, obtained 203 seconds after the initial burst of γ-rays from GRB 060418, using a ring polarimeter on the robotic Liverpool Telescope. Our robust (2σ) upper limit on the percentage of polarization, less than 8%, coincides with the fireball deceleration time at the onset of the afterglow. The combination of the rate of decay of the optical brightness and the low polarization at this critical time constrains standard models of GRB ejecta, ruling out the presence of a large-scale ordered magnetic field in the emitting region.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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