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Zoekopdracht: journal id: "astronomyxandxastrophysics"

AuteursE. Rol, R.A.M.J. Wijers, J.U. Fynbo, J. Hjorth, J. Gorosabel, M.P. Egholm, J.M. Castro Ceron, A.J. Castro-Tirado, L. Kaper, N. Masetti, E. Palazzi, E. Pian, N. Tanvir, P.M. Vreeswijk, C. Kouveliotou, P. Moller, H. Pedersen, A.S. Fruchter, J. Rhoads, I. Burud, M.I. de Salamanca, E.P.J. van den Heuvel
TitelVariable polarization in the optical afterglow of GRB 021004
TijdschriftAstronomy and Astrophysics
Jaargang405
Jaar2003
Pagina'sL23-L27
ISSN00046361
FaculteitFaculteit der Natuurwetenschappen, Wiskunde en Informatica
Instituut/afd.FNWI: Astronomical Institute Anton Pannekoek (IAP)
TrefwoordenGamma ray bursts; Gamma ray polarization
SamenvattingWe present polarimetric observations of the afterglow of gamma-ray burst (GRB) 021004, obtained with the Nordic Optical Telescope (NOT) and the Very Large Telescope (VLT) between 8 and 17 hours after the burst. Comparison among the observations shows a 45 degree change in the position angle from 9 hours after the burst to 16 hours after the burst, and comparison with published data from later epochs even shows a 90 degree change between 9 and 89 hours after the burst. The degree of linear polarization shows a marginal change, but is also consistent with being constant in time. In the context of currently available models for changes in the polarization of GRBs, a homogeneous jet with an early break time of tb ~ 1 day provides a good explanation of our data. The break time is a factor 2 to 6 earlier than has been found from the analysis of the optical light curve. The change in the position angle of the polarization rules out a structured jet model for the GRB. Based on observations made with the Nordic Optical Telescope; based on observations collected at the European Southern Observatory, Chile, by GRACE (Gamma-Ray Burst Afterglow Collaboration at ESO), under programme 70.D-0523(A).
Opmerkingencop. 2003 EDP sciences
Soort documentArtikel
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