The IXPE View of GRB 221009A
Date Issued
2023
Author(s)
Negro, Michela
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Di Lalla, Niccolò
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Omodei, Nicola
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Veres, Péter
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Manfreda, Alberto
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Burns, Eric
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Baldini, Luca
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Ehlert, Steven R.
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Kennea, Jamie A.
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Liodakis, Ioannis
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Marshall, Herman L.
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O'Dell, Stephen L.
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Roberts, Oliver J.
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Romani, Roger W.
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Sgró, Carmelo
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Terashima, Masanobu
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Viscolo, Domenico
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Latronico, Luca
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Puccetti, Simonetta
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Poutanen, Juri
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Rogantini, Daniele
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Slane, Patrick
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Lindfors, Elina
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Nilsson, Kari
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Kasikov, Anni
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Marscher, Alan P.
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Cibrario, Nicoló
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Gunji, Shuichi
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Yang, Yi-Jung
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Zane, Silvia
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Weisskopf, Martin C.
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Agudo, Iván
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Baumgartner, Wayne H.
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Bellazzini, Ronaldo
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Bianchi, Stefano
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Bongiorno, Stephen D.
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Bonino, Raffaella
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Brez, Alessandro
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Castellano, Simone
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Cavazzuti, Elisabetta
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Chen, Chien-Ting
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Ciprini, Stefano
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Di Gesu, Laura
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Donnarumma, Immacolata
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Doroshenko, Victor
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Dovc̆iak, Michal
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Enoto, Teruaki
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Garcia, Javier A.
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Hayashida, Kiyoshi
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Heyl, Jeremy
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Iwakiri, Wataru
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Jorstad, Svetlana G.
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Kaaret, Philip
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Karas, Vladimir
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Kislat, Fabian
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Kitaguchi, Takao
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Kolodziejczak, Jeffery J.
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Krawczynski, Henric
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Maldera, Simone
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Marin, Frédéric
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Marinucci, Andrea
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Mitsuishi, Ikuyuki
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Mizuno, Tsunefumi
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Ng, C. -Y.
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Oppedisano, Chiara
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Pavlov, George G.
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Peirson, Abel L.
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Pesce-Rollins, Melissa
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Petrucci, Pierre-Olivier
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Ramsey, Brian D.
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Spandre, Gloria
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Swartz, Douglas A.
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Tamagawa, Toru
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Taverna, Roberto
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Tawara, Yuzuru
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Tennant, Allyn F.
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Thomas, Nicholas E.
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Tsygankov, Sergey S.
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Turolla, Roberto
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Vink, Jacco
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Wu, Kinwah
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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....
Volume
946
Issue
1
Start page
L21
Issn Identifier
2041-8205
Rights
open.access
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