Evolution of the polarization of the optical afterglow of the γ-ray burst GRB030329

Jochen Greiner*, Sylvio Klose, Klaus Reinsch, Hans Martin Schmid, Re'Em Sari, Dieter H. Hartmann, Chryssa Kouveliotou, Arne Rau, Eliana Palazzi, Christian Straubmeier, Bringfried Stecklum, Sergej Zharikov, Gaghik Tovmassian, Otto Bärnbantner, Christoph Ries, Emmanuel Jehin, Arne Henden, Anlaug A. Kaas, Tommy Grav, Jens HjorthHolger Pedersen, Ralph A.M.J. Wijers, Andreas Kaufer, Hye Sook Park, Grant Williams, Olaf Reimer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

105 Scopus citations


The association of a supernova with GRB030329 strongly supports the 'collapsar' model of γ-ray bursts, where a relativistic jet forms after the progenitor star collapses. Such jets cannot be spatially resolved because γ-ray bursts lie at cosmological distances; their existence is instead inferred from 'breaks' in the light curves of the afterglows, and from the theoretical desire to reduce the estimated total energy of the burst by proposing that most of it comes out in narrow beams. Temporal evolution of the polarization of the afterglows may provide independent evidence for the jet structure of the relativistic outflow. Small-level polarization (∼1-3 per cent) has been reported for a few bursts, but its temporal evolution has yet to be established. Here we report polarimetric observations of the afterglow of GRB030329. We establish the polarization light curve, detect sustained polarization at the per cent level, and find significant variability. The data imply that the afterglow magnetic field has a small coherence length and is mostly random, probably generated by turbulence, in contrast with the picture arising from the high polarization detected in the prompt γ-rays from GRB021206 (ref. 18).

Original languageAmerican English
Pages (from-to)157-159
Number of pages3
Issue number6963
StatePublished - 13 Nov 2003
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgements GRB research at Caltech is supported in part by NSF and NASA. We are indebted to S. Barthelmy and the GCN. The VLA is operated by the National Radio Astronomy Observatory, a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The Australia Telescope is funded by the Commonwealth of Australia for operations as a National Facility managed by CSIRO. The Ryle Telescope is supported by PPARC.


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