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GRB 990712: First Detection of Polarization Variability in a Gamma-ray Burst AfterglowWe report the detection of significant polarization in the afterglow of GRB 990712 on three instances 0.44-1.45 days after the gamma-ray burst. This polarization is intrinsic to the afterglow. The degree of polarization is not constant, and smallest at the second measurement. The polarization angle does not vary significantly during these observations. We find that none of the existing models predict such polarization variations constant polarization angle, and discuss ways in which these models might be modified to accommodate the observed behavior of this afterglow.
Document ID
20000074105
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Rol, E.
(Amsterdam Univ. Netherlands)
Wijers, R. A. M. J.
(State Univ. of New York Stony Brook, NY United States)
Vreeswijk, P. M.
(Amsterdam Univ. Netherlands)
Galama, T. J.
(California Inst. of Tech. Pasadena, CA United States)
vanParadijs, J.
(Amsterdam Univ. Netherlands)
Kouveliotou, C.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Pian, E.
(Consiglio Nazionale delle Ricerche Bologna, Italy)
Palazzi, E.
(Consiglio Nazionale delle Ricerche Bologna, Italy)
Frontera, F.
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Space Radiation
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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