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Early-time polarized optical light curve of GRB 131030A

King, O. G. and Baloković, M. and Hovatta, T. and Pearson, T. J. and Readhead, A. C. S. (2014) Early-time polarized optical light curve of GRB 131030A. Monthly Notices of the Royal Astronomical Society, 445 (1). L114-L118. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20141204-084818120

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Abstract

We report the polarized optical light curve of a gamma-ray burst afterglow obtained using the RoboPol instrument. Observations began 655 s after the initial burst of gamma-rays from GRB 131030A, and continued uninterrupted for 2 h. The afterglow displayed a low, constant fractional linear polarization of p = (2.1 ± 1.6) per cent throughout, which is similar to the interstellar polarization measured on nearby stars. The optical brightness decay is consistent with a forward-shock propagating in a medium of constant density, and the low polarization fraction indicates a disordered magnetic field in the shock front. This supports the idea that the magnetic field is amplified by plasma instabilities on the shock front. These plasma instabilities produce strong magnetic fields with random directions on scales much smaller than the total observable region of the shock, and the resulting randomly-oriented polarization vectors sum to produce a low net polarization over the total observable region of the shock.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/mnrasl/slu149DOIArticle
http://mnrasl.oxfordjournals.org/content/445/1/L114PublisherArticle
http://arxiv.org/abs/1409.2417arXivArticle
ORCID:
AuthorORCID
Pearson, T. J.0000-0001-5213-6231
Additional Information:© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 September 7. Received 2014 September 5; in original form 2014 July 11. First published online October 14, 2014. The RoboPol project is a collaboration between Caltech in the USA, MPIfR in Germany, Toruń Centre for Astronomy in Poland, the University of Crete/FORTH in Greece, and IUCAA in India. The University of Crete group acknowledges support by the ‘RoboPol’ project, which is implemented under the ‘Aristeia’ Action of the ‘Operational Programme Education and Lifelong Learning’ and is co-funded by the European Social Fund (ESF) and Greek National Resources, and by the European Commission Seventh Framework Programme (FP7) through grants PCIG10-GA-2011-304001 ‘JetPop’ and PIRSES-GA-2012-31578 ‘EuroCal’. This research was supported in part by NASA grant NNX11A043G and NSF grant AST-1109911, and by the Polish National Science Centre, grant number 2011/01/B/ST9/04618. KT acknowledges support by the European Commission Seventh Framework Programme (FP7) through the Marie Curie Career Integration Grant PCIG-GA-2011-293531 ‘SFOnset’. MB acknowledges support from the International Fulbright Science and Technology Award. IM and SK are supported for this research through a stipend from the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne. TH was supported by the Academy of Finland project number 267324. This research made use of ASTROPY, http://www.astropy.org, a community-developed core PYTHON package for Astronomy (Astropy Collaboration et al. 2013). This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Funders:
Funding AgencyGrant Number
European Social Fund (ESF) UNSPECIFIED
Greek National ResourcesUNSPECIFIED
European Commission Seventh Framework Programme (FP7)PCIG10-GA-2011-304001
European Commission Seventh Framework Programme (FP7)PIRSES-GA-2012-31578
NASANNX11A043G
NSFAST-1109911
Polish National Science Centre2011/01/B/ST9/04618
European Commission Seventh Framework Programme (FP7)PCIG-GA-2011-293531
International Fulbright Science and Technology AwardUNSPECIFIED
International Max Planck Research School (IMPRS) for Astronomy and AstrophysicsUNSPECIFIED
Academy of Finland267324
Subject Keywords:magnetic fields; polarization; shock waves; gamma-ray burst: individual: GRB 131030A
Record Number:CaltechAUTHORS:20141204-084818120
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141204-084818120
Official Citation:King, O. G., Blinov, D., Giannios, D., Papadakis, I., Angelakis, E., Baloković, M., . . . Zensus, J. A. (2014). Early-time polarized optical light curve of GRB 131030A. Monthly Notices of the Royal Astronomical Society: Letters, 445(1), L114-L118. doi: 10.1093/mnrasl/slu149
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52369
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:04 Dec 2014 18:27
Last Modified:20 Nov 2015 20:29

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