Steele 2010 观测到了GRB 090102的10%的光学偏振

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Title:		Ten per cent polarized optical emission from GRB090102
Authors:		Steele, I. A.; Mundell, C. G.; Smith, R. J.; Kobayashi, S.; Guidorzi, C.
Affiliation:		AA(Astrophysics Research Institute, Liverpool John Moores University, CH41 1LD, UK), AB(Astrophysics Research Institute, Liverpool John Moores University, CH41 1LD, UK), AC(Astrophysics Research Institute, Liverpool John Moores University, CH41 1LD, UK), AD(Astrophysics Research Institute, Liverpool John Moores University, CH41 1LD, UK), AE(Physics Department, University of Ferrara, Via Saragat 1, 44122 Ferrara, Italy)
Publication:		Nature, Volume 462, Issue 7274, pp. 767-769 (2009). (Nature Homepage)
Publication Date:		12/2009
Origin:		NATURE
DOI:		10.1038/nature08590
Bibliographic Code:		2009Natur.462..767S

Abstract

The nature of the jets and the role of magnetic fields in gamma-ray bursts (GRBs) remains unclear. In a baryon-dominated jet only weak, tangled fields generated in situ through shocks would be present. In an alternative model, jets are threaded with large-scale magnetic fields that originate at the central engine and that accelerate and collimate the material. To distinguish between the models the degree of polarization in early-time emission must be measured; however, previous claims of gamma-ray polarization have been controversial. Here we report that the early optical emission from GRB090102 was polarized at 10+/-1 per cent, indicating the presence of large-scale fields originating in the expanding fireball. If the degree of polarization and its position angle were variable on timescales shorter than our 60-second exposure, then the peak polarization may have been larger than ten per cent.

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