MG12 - Talk detail |
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Participant |
Götz, Diego | |
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Institution |
CEA Saclay - Service d'Astrophysique - Orme de Merisiers, Bat 709 - Gif sur Yvette - Ile de France - France | |
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Session |
Talk |
Abstract |
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GRB3 |
GRB prompt emission polarization measurements using INTEGRAL/IBIS |
We will present the polarization measurements of the prompt emission of GRB 041219A made with IBIS on board INTEGRAL. For this very long and bright Gamma-Ray Burst we detected a time variable higly polarized signal in the 200-800 keV energy range. Our results favor GRB models where the prompt emission at these energies is produced by synchrotron radiation from a relativistic outflow with a magnetic field, which is coherent on an angular size comparable with the angular size of the emitting region (~1/Γ). We will also present the upper limits we obtained for fainter GRBs detected with INTEGRAL. |