The IXPE View of GRB 221009A
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Published:2023-03-01
Issue:1
Volume:946
Page:L21
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ISSN:2041-8205
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Container-title:The Astrophysical Journal Letters
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language:
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Short-container-title:ApJL
Author:
Negro MichelaORCID, Di Lalla NiccolòORCID, Omodei NicolaORCID, Veres PéterORCID, Silvestri StefanoORCID, Manfreda AlbertoORCID, Burns EricORCID, Baldini LucaORCID, Costa EnricoORCID, Ehlert Steven R.ORCID, Kennea Jamie A.ORCID, Liodakis IoannisORCID, Marshall Herman L.ORCID, Mereghetti SandroORCID, Middei RiccardoORCID, Muleri FabioORCID, O’Dell Stephen L.ORCID, Roberts Oliver J.ORCID, Romani Roger W.ORCID, Sgró CarmeloORCID, Terashima MasanobuORCID, Tiengo AndreaORCID, Viscolo DomenicoORCID, Di Marco AlessandroORCID, La Monaca FabioORCID, Latronico LucaORCID, Matt GiorgioORCID, Perri MatteoORCID, Puccetti SimonettaORCID, Poutanen JuriORCID, Ratheesh AjayORCID, Rogantini DanieleORCID, Slane PatrickORCID, Soffitta PaoloORCID, Lindfors ElinaORCID, Nilsson KariORCID, Kasikov AnniORCID, Marscher Alan P.ORCID, Tavecchio FabrizioORCID, Cibrario NicolóORCID, Gunji ShuichiORCID, Malacaria ChristianORCID, Paggi AlessandroORCID, Yang Yi-JungORCID, Zane SilviaORCID, Weisskopf Martin C.ORCID, Agudo IvánORCID, Antonelli Lucio A.ORCID, Bachetti MatteoORCID, Baumgartner Wayne H.ORCID, Bellazzini RonaldoORCID, Bianchi StefanoORCID, Bongiorno Stephen D.ORCID, Bonino RaffaellaORCID, Brez AlessandroORCID, Bucciantini NiccolòORCID, Capitanio FiammaORCID, Castellano SimoneORCID, Cavazzuti ElisabettaORCID, Chen Chien-TingORCID, Ciprini StefanoORCID, De Rosa AlessandraORCID, Del Monte EttoreORCID, Di Gesu LauraORCID, Donnarumma ImmacolataORCID, Doroshenko VictorORCID, Dovc̆iak MichalORCID, Enoto TeruakiORCID, Evangelista YuriORCID, Fabiani SergioORCID, Ferrazzoli RiccardoORCID, Garcia Javier A.ORCID, Hayashida Kiyoshi, Heyl JeremyORCID, Iwakiri WataruORCID, Jorstad Svetlana G.ORCID, Kaaret PhilipORCID, Karas VladimirORCID, Kislat FabianORCID, Kitaguchi Takao, Kolodziejczak Jeffery J.ORCID, Krawczynski HenricORCID, Maldera SimoneORCID, Marin FrédéricORCID, Marinucci AndreaORCID, Mitsuishi Ikuyuki, Mizuno TsunefumiORCID, Ng C.-Y.ORCID, Oppedisano ChiaraORCID, Papitto AlessandroORCID, Pavlov George G.ORCID, Peirson Abel L.ORCID, Pesce-Rollins MelissaORCID, Petrucci Pierre-OlivierORCID, Pilia MauraORCID, Possenti AndreaORCID, Ramsey Brian D.ORCID, Rankin JohnORCID, Spandre GloriaORCID, Swartz Douglas A.ORCID, Tamagawa ToruORCID, Taverna RobertoORCID, Tawara Yuzuru, Tennant Allyn F.ORCID, Thomas Nicholas E.ORCID, Tombesi FrancescoORCID, Trois AlessioORCID, Tsygankov Sergey S.ORCID, Turolla RobertoORCID, Vink JaccoORCID, Wu KinwahORCID, Xie FeiORCID
Abstract
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.
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
15 articles.
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