Data di Pubblicazione:
2023
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.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
Negro M.; Di Lalla N.; Omodei N.; Veres P.; Silvestri S.; Manfreda A.; Burns E.; Baldini L.; Costa E.; Ehlert S.R.; Kennea J.A.; Liodakis I.; Marshall H.L.; Mereghetti S.; Middei R.; Muleri F.; O'Dell S.L.; Roberts O.J.; Romani R.W.; Sgro C.; Terashima M.; Tiengo A.; Viscolo D.; Di Marco A.; La Monaca F.; Latronico L.; Matt G.; Perri M.; Puccetti S.; Poutanen J.; Ratheesh A.; Rogantini D.; Slane P.; Soffitta P.; Lindfors E.; Nilsson K.; Kasikov A.; Marscher A.P.; Tavecchio F.; Cibrario N.; Gunji S.; Malacaria C.; Paggi A.; Yang Y.-J.; Zane S.; Weisskopf M.C.; Agudo I.; Antonelli L.A.; Bachetti M.; Baumgartner W.H.; Bellazzini R.; Bianchi S.; Bongiorno S.D.; Bonino R.; Brez A.; Bucciantini N.; Capitanio F.; Castellano S.; Cavazzuti E.; Chen C.-T.; Ciprini S.; De Rosa A.; Del Monte E.; Di Gesu L.; Donnarumma I.; Doroshenko V.; Dovciak M.; Enoto T.; Evangelista Y.; Fabiani S.; Ferrazzoli R.; Garcia J.A.; Hayashida K.; Heyl J.; Iwakiri W.; Jorstad S.G.; Kaaret P.; Karas V.; Kislat F.; Kitaguchi T.; Kolodziejczak J.J.; Krawczynski H.; Maldera S.; Marin F.; Marinucci A.; Mitsuishi I.; Mizuno T.; Ng C.-Y.; Oppedisano C.; Papitto A.; Pavlov G.G.; Peirson A.L.; Pesce-Rollins M.; Petrucci P.-O.; Pilia M.; Possenti A.; Ramsey B.D.; Rankin J.; Spandre G.; Swartz D.A.; Tamagawa T.; Taverna R.; Tawara Y.; Tennant A.F.; Thomas N.E.; Tombesi F.; Trois A.; Tsygankov S.S.; Turolla R.; Vink J.; Wu K.; Xie F.
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