GRB 990712: First Indication of Polarization Variability in a Gamma‐Ray Burst Afterglow | Zendy

E. Rol | Zendy; R. A. M. J. Wijers | Zendy; P. M. Vreeswijk | Zendy; L. Kaper | Zendy; T. J. Galama | Zendy; J. van Paradijs | Zendy; C. Kouveliotou | Zendy; N. Masetti | Zendy; E. Pian | Zendy; E. Palazzi | Zendy; F. Frontera | Zendy; E. P. J. van den Heuvel | Zendy

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GRB 990712: First Indication of Polarization Variability in a Gamma‐Ray Burst Afterglow

Author(s) -

E. Rol,

R. A. M. J. Wijers,

P. M. Vreeswijk,

L. Kaper,

T. J. Galama,

J. van Paradijs,

C. Kouveliotou,

N. Masetti,

E. Pian,

E. Palazzi,

F. Frontera,

E. P. J. van den Heuvel

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/317256

Subject(s) - afterglow , gamma ray burst , polarization (electrochemistry) , astrophysics , physics , degree of polarization , optics , chemistry , scattering

We report the detection of significant polarization in the optical afterglowof GRB990712 on three instances 0.44, 0.70 and 1.45 days after the gamma-rayburst, with (P, theta) being (2.9% +- 0.4%, 121.1 degr +- 3.5 degr), (1.2% +-0.4%, 116.2 degr +- 10.1 degr) and (2.2% +- 0.7%, 139.2 degr +- 10.4 degr)respectively. The polarization is intrinsic to the afterglow. The degree ofpolarization is not constant, and smallest at the second measurement. Thepolarization angle does not vary significantly during these observations. Wefind that none of the existing models predict such polarization variations atconstant polarization angle, and suggest ways in which these models might bemodified to accommodate the observed behavior of this afterglow.Comment: 10 pages including 6 figures, accepted by ApJ. Uses aastex 5.

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