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Linear and circular polarimetry observations of gamma-ray burstafterglows

Published online by Cambridge University Press:  22 July 2013

K. Wiersema
K. Wiersema*
Affiliation:
University of Leicester, University Road, Leicester LE1 7RH, UK
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Abstract

Follow-up observations of large numbers of gamma-ray burst (GRB) afterglows, facilitatedby the Swift satellite, have produced a large sample of spectral energy distributions andlight curves, from which the basic micro- and macrophysical parameters of afterglows maybe derived. However, a number of phenomena have been observed that defy explanation bysimple versions of the standard fireball model, leading to a variety of new models.Polarimetry has shown great promise as a diagnosis of afterglow physics, probing themagnetic field properties of the afterglow and geometrical effects (e.g.jet breaks). Unfortunately, high quality polarimetry of a significant sample ofafterglows is difficult to acquire, requiring specialised instrumentation and observingmodes. In this talk I will review the recent successes in afterglow polarimetry, alsoshowing first results of new instruments and observing campaigns. I will particularlyfocus on jet breaks.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 61: Gamma-ray Bursts: 15 Years of GRB Afterglows – Progenitors, Environments and Host Galaxies from the Nearby to the Early Universe , 2013 , pp. 195 - 201
Copyright
© EAS, EDP Sciences 2013

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