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Article: The IXPE View of GRB 221009A

TitleThe IXPE View of GRB 221009A
Authors
Issue Date1-Mar-2023
PublisherAmerican Astronomical Society
Citation
Astrophysical Journal Letters, 2023, v. 946, n. 1, p. 1-21 How to Cite?
Abstract

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 ∼55% and ∼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.


Persistent Identifierhttp://hdl.handle.net/10722/331301
ISSN
2023 Impact Factor: 8.8
2023 SCImago Journal Rankings: 2.766
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorNegro, M-
dc.contributor.authorDi Lallaa, N-
dc.contributor.authorOmodei, N-
dc.contributor.authorVeres, P-
dc.contributor.authorSilvestri, S-
dc.contributor.authorManfreda, A-
dc.contributor.authorBurns, E-
dc.contributor.authorBaldini, L-
dc.contributor.authorCosta, E-
dc.contributor.authorEhlert, SR-
dc.contributor.authorKennea, JA-
dc.contributor.authorLiodakis, I-
dc.contributor.authorMarshall, HL-
dc.contributor.authorMereghetti, S-
dc.contributor.authorMiddei, R-
dc.contributor.authorMuleri, F-
dc.contributor.authorO'Dell, SL-
dc.contributor.authorRoberts, OJ-
dc.contributor.authorRomani, RW-
dc.contributor.authorSgro, C-
dc.contributor.authorTerashima, M-
dc.contributor.authorTiengo, A-
dc.contributor.authorViscolo, D-
dc.contributor.authorDi Marco, A-
dc.contributor.authorLa Monaca, F-
dc.contributor.authorLatronico, L-
dc.contributor.authorMatt, G-
dc.contributor.authorPerri, M-
dc.contributor.authorPuccetti, S-
dc.contributor.authorPoutanen, J-
dc.contributor.authorRatheesh, A-
dc.contributor.authorRogantini, D-
dc.contributor.authorSlane, P-
dc.contributor.authorSoffitta, P-
dc.contributor.authorLindfors, E-
dc.contributor.authorNilsson, K-
dc.contributor.authorKasikov, A-
dc.contributor.authorMarscher, AP-
dc.contributor.authorTavecchio, F-
dc.contributor.authorCibrario, N-
dc.contributor.authorGunji, S-
dc.contributor.authorMalacaria, C-
dc.contributor.authorPaggi, A-
dc.contributor.authorYang, YJ-
dc.contributor.authorNg, CY-
dc.contributor.authoret al-
dc.date.accessioned2023-09-21T06:54:30Z-
dc.date.available2023-09-21T06:54:30Z-
dc.date.issued2023-03-01-
dc.identifier.citationAstrophysical Journal Letters, 2023, v. 946, n. 1, p. 1-21-
dc.identifier.issn2041-8205-
dc.identifier.urihttp://hdl.handle.net/10722/331301-
dc.description.abstract<p>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 ∼55% and ∼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.<br></p>-
dc.languageeng-
dc.publisherAmerican Astronomical Society-
dc.relation.ispartofAstrophysical Journal Letters-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleThe IXPE View of GRB 221009A-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.3847/2041-8213/acba17-
dc.identifier.scopuseid_2-s2.0-85151331839-
dc.identifier.volume946-
dc.identifier.issue1-
dc.identifier.spage1-
dc.identifier.epage21-
dc.identifier.eissn2041-8213-
dc.identifier.isiWOS:000982868800001-
dc.identifier.issnl2041-8205-

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