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Titolo:
GRB 990712: First indication of polarization variability in a gamma-ray burst afterglow
Autore:
Rol, E; Wijers, RAMJ; Vreeswijk, PM; Kaper, L; Galama, TJ; van Paradijs, J; Kouveliotou, C; Masetti, N; Pian, E; Palazzi, E; Frontera, F; van den Heuvel, EPJ;
Indirizzi:
Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands Univ Amsterdam Amsterdam Netherlands NL-1098 SJ J Amsterdam, Netherlands SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA SUNY StonyBrook Stony Brook NY USA 11794 tron, Stony Brook, NY 11794 USA CALTECH, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125CALTECH, Pasadena, CA 91125 USA Univ Alabama, Dept Phys, Huntsville, AL 35899 USA Univ Alabama HuntsvilleAL USA 35899 Dept Phys, Huntsville, AL 35899 USA NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA NASA Huntsville AL USA 35812 l Space Flight Ctr, Huntsville, AL 35812 USA Univ Ferrara, Dept Phys, I-44100 Ferrara, Italy Univ Ferrara Ferrara Italy I-44100 ra, Dept Phys, I-44100 Ferrara, Italy
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 2, volume: 544, anno: 2000,
parte:, 1
pagine: 707 - 711
SICI:
0004-637X(200012)544:2<707:G9FIOP>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIGHT CURVES; GRB-990510; FIREBALL; EMISSION; SIZE;
Keywords:
gamma rays : bursts; polarization; radiation mechanisms : nonthermal turbulence;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Rol, E Univ Amsterdam, Astron Inst Anton Pannekoek, Kruislaan 403, NL-1098SJ Amsterdam, Netherlands Univ Amsterdam Kruislaan 403 Amsterdam Netherlands NL-1098 SJ ands
Citazione:
E. Rol et al., "GRB 990712: First indication of polarization variability in a gamma-ray burst afterglow", ASTROPHYS J, 544(2), 2000, pp. 707-711

Abstract

We report the detection of significant polarization in the optical afterglow of GRB 990712 on three instances: 0.44, 0.70, and 1.45 days after the gamma-ray burst, with (P, theta) being (2.9% +/- 0.4%, 121 degrees .1 +/- 3 degrees .5), (1.2% +/- 0.4%, 116 degrees .2 +/- 10 degrees .1), and (2.2% +/- 0.7%, 139 degrees .2 +/- 10 degrees .4), respectively. The polarization is intrinsic to the afterglow. The degree of polarization is not constant and is 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 at a constant polarization angle; we suggest ways in which these models might be modified to accommodate the observed behavior of this afterglow.

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Documento generato il 18/11/17 alle ore 03:46:52