Circular polarization in the optical afterglow of GRB 121024A

K. Wiersema (), S. Covino, K. Toma, A. J. van der Horst, K. Varela, M. Min, J. Greiner, R. L. C. Starling, N. R. Tanvir, R. A. M. J. Wijers, S. Campana, P. A. Curran, Y. Fan, J. P. U. Fynbo, J. Gorosabel, A. Gomboc, D. Götz, J. Hjorth, Z. P. Jin, S. Kobayashi, C. Kouveliotou, C. Mundell, P. T. O’Brien, E. Pian, A. Rowlinson, D. M. Russell, R. Salvaterra, S. di Serego Alighieri, G. Tagliaferri, S. D. Vergani, J. Elliott, C. Fariña, O. E. Hartoog, R. Karjalainen, S. Klose, F. Knust, A. J. Levan, P. Schady, V. Sudilovsky and R. Willingale
Additional contact information
K. Wiersema: University of Leicester
S. Covino: INAF/Brera Astronomical Observatory, via Bianchi 46
K. Toma: Osaka University
A. J. van der Horst: Astronomical Institute ‘Anton Pannekoek’, University of Amsterdam
K. Varela: Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany
M. Min: Astronomical Institute ‘Anton Pannekoek’, University of Amsterdam
J. Greiner: Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany
R. L. C. Starling: University of Leicester
N. R. Tanvir: University of Leicester
R. A. M. J. Wijers: Astronomical Institute ‘Anton Pannekoek’, University of Amsterdam
S. Campana: INAF/Brera Astronomical Observatory, via Bianchi 46
P. A. Curran: International Centre for Radio Astronomy Research, Curtin University
Y. Fan: Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Science
J. P. U. Fynbo: Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK 2100 Copenhagen, Denmark
J. Gorosabel: Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía s/n, E-18008 Granada, Spain
A. Gomboc: Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
D. Götz: AIM (UMR 7158 CEA/DSM-CNRS-Université Paris Diderot) Irfu/Service d’Astrophysique, Saclay, F-91191 Gif-sur-Yvette Cedex, France
J. Hjorth: Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK 2100 Copenhagen, Denmark
Z. P. Jin: Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Science
S. Kobayashi: Astrophysics Research Institute, Liverpool John Moores University, Liverpool Science Park, IC2 Building, 146 Brownlow Hill, Liverpool L3 5RF, UK
C. Kouveliotou: Space Science Office, ZP12, NASA/Marshall Space Flight Center
C. Mundell: Astrophysics Research Institute, Liverpool John Moores University, Liverpool Science Park, IC2 Building, 146 Brownlow Hill, Liverpool L3 5RF, UK
P. T. O’Brien: University of Leicester
E. Pian: Scuola Normale Superiore, 7, I-56126 Pisa, Italy
A. Rowlinson: Astronomical Institute ‘Anton Pannekoek’, University of Amsterdam
D. M. Russell: Instituto de Astrofísica de Canarias (IAC)
R. Salvaterra: INAF/IASF Milano, via E. Bassini 15, 20133 Milano, Italy
S. di Serego Alighieri: INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
G. Tagliaferri: INAF/Brera Astronomical Observatory, via Bianchi 46
S. D. Vergani: INAF/Brera Astronomical Observatory, via Bianchi 46
J. Elliott: Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany
C. Fariña: Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Canary Islands, Spain
O. E. Hartoog: Astronomical Institute ‘Anton Pannekoek’, University of Amsterdam
R. Karjalainen: Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Canary Islands, Spain
S. Klose: Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
F. Knust: Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany
A. J. Levan: University of Warwick
P. Schady: Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany
V. Sudilovsky: Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany
R. Willingale: University of Leicester

Nature, 2014, vol. 509, issue 7499, 201-204

Abstract: Circularly polarized light is unexpectedly detected in the afterglow of γ-ray burst GRB 121024A measured 0.15 days after the burst, and is shown to be intrinsic to the afterglow and unlikely to be produced by dust scattering or plasma propagation effects.

Date: 2014
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DOI: 10.1038/nature13237

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