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The IXPE View of GRB 221009A
- 1.0573059 - ASÚ 2024 RIV US eng J - Journal Article
Negro, M. - Di Lalla, N. - Omodei, N. - Dovčiak, Michal - Karas, Vladimír … Total 112 authors
The IXPE View of GRB 221009A.
Astrophysical Journal Letters. Roč. 946, č. 1 (2023), č. článku L21. ISSN 2041-8205. E-ISSN 2041-8213
Institutional support: RVO:67985815
Keywords : gamma-ray bursts * polarimetry * X-ray astronomy
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 8.8, year: 2023
Method of publishing: Open access
We present the IXPE observation of GRB 221009A, which includes upper limits on the linear polarization degree of both prompt and afterglow emission in the soft X-ray energy band. GRB 221009A is an exceptionally bright gamma-ray burst (GRB) that reached Earth on 2022 October 9 after traveling through the dust of the Milky Way. The Imaging X-ray Polarimetry Explorer (IXPE) pointed at GRB 221009A on October 11 to observe, for the first time, the 2-8 keV X-ray polarization of a GRB afterglow. We set an upper limit to the polarization degree of the afterglow emission of 13.8% at a 99% confidence level. This result provides constraints on the jet opening angle and the viewing angle of the GRB, or alternatively, other properties of the emission region. Additionally, IXPE captured halo-rings of dust-scattered photons that are echoes of the GRB prompt emission. The 99% confidence level upper limit to the prompt polarization degree depends on the background model assumption, and it ranges between similar to 55% and similar to 82%. This single IXPE pointing provides both the first assessment of X-ray polarization of a GRB afterglow and the first GRB study with polarization observations of both the prompt and afterglow phases.
Permanent Link: https://hdl.handle.net/11104/0343828
File Download Size Commentary Version Access 573059.pdf 2 3.1 MB Publisher’s postprint open-access
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