PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
The IXPE view of GRB 221009A
N. Di Lalla*, M. Negro, N. Omodei, P. Veres, S. Silvestri, A. Manfreda and E. Burns
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Pre-published on: August 17, 2023
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GRB 221009A is an exceptionally bright gamma-ray burst (GRB) that reached Earth on October 9th, 2022 after traveling through the dust of the Milky Way. The Imaging X-ray Polarimetry Explorer (IXPE) pointed at GRB 221009A on October 11th and measured, for the first time, the 2-8 keV X-ray polarization of both a GRB afterglow and rings of dust-scattered photons which are echoes of the GRB prompt emission. We set upper limits to the polarization degree of the afterglow and the prompt emission of respectively 13.8% and 55% at a 99% confidence level, providing constraints on the jet opening angle of the GRB and other properties of the emitting region. In this contribution, I present on behalf on the IXPE Collaboration the results of the analysis and interpretation of the IXPE observation of GRB 221009A.
DOI: https://doi.org/10.22323/1.444.0870
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