The IXPE View of GRB 221009A
Negro Michela; Di Lalla Niccolò; Omodei Nicola; Veres Péter; Silvestri Stefano; Manfreda Alberto; Burns Eric; Baldini Luca; Costa Enrico; Ehlert Steven R.; Kennea Jamie A.; Liodakis Ioannis; Marshall Herman L.; Mereghetti Sandro; Middei Riccardo; Muleri Fabio; O'Dell Stephen L.; Roberts Oliver J.; Romani Roger W.; Sgró Carmelo; Terashima Masanobu; Tiengo Andrea; Viscolo Domenico; Di Marco Alessandro; La Monaca Fabio; Latronico Luca; Matt Giorgio; Perri Matteo; Puccetti Simonetta; Poutanen Juri; Ratheesh Ajay; Rogantini Daniele; Slane Patrick; Soffitta Paolo; Lindfors Elina; Nilsson Kari; Kasikov Anni; Marscher Alan P.; Tavecchio Fabrizio; Cibrario Nicoló; Gunji Shuichi; Malacaria Christian; Paggi Alessandro; Yang Yi-Jung; Zane Silvia; Weisskopf Martin C.; Agudo Iván; Antonelli Lucio A.; Bachetti Matteo; Baumgartner Wayne H.; Bellazzini Ronaldo; Bianchi Stefano; Bongiorno Stephen D.; Bonino Raffaella; Brez Alessandro; Bucciantini Niccolò; Capitanio Fiamma; Castellano Simone; Cavazzuti Elisabetta; Chen Chien-Ting; Ciprini Stefano; De Rosa Alessandra; Del Monte Ettore; Di Gesu Laura; Donnarumma Immacolata; Doroshenko Victor; Dovc̆iak Michal; Enoto Teruaki; Evangelista Yuri; Fabiani Sergio; Ferrazzoli Riccardo; Garcia Javier A.; Hayashida Kiyoshi; Heyl Jeremy; Iwakiri Wataru; Jorstad Svetlana G.; Kaaret Philip; Karas Vladimir; Kislat Fabian; Kitaguchi Takao; Kolodziejczak Jeffery J.; Krawczynski Henric; Maldera Simone; Marin Frédéric; Marinucci Andrea; Mitsuishi Ikuyuki; Mizuno Tsunefumi; Ng C.-Y.; Oppedisano Chiara; Papitto Alessandro; Pavlov George G.; Peirson Abel L.; Pesce-Rollins Melissa; Petrucci Pierre-Olivier; Pilia Maura; Possenti Andrea; Ramsey Brian D.; Rankin John; Spandre Gloria; Swartz Douglas A.; Tamagawa Toru; Taverna Roberto; Tawara Yuzuru; Tennant Allyn F.; Thomas Nicholas E.; Tombesi Francesco; Trois Alessio; Tsygankov Sergey S.; Turolla Roberto; Vink Jacco; Wu Kinwah; Xie Fei
https://urn.fi/URN:NBN:fi-fe2023042839255
Tiivistelmä
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.
Kokoelmat
- Rinnakkaistallenteet [27094]