Spectropolarimetry and photometry of the early afterglow of the gamma-ray burst GRB 191221B

doi:10.1093/mnras/stab1791

	Spectropolarimetry and photometry of the early afterglow of the gamma-ray burst GRB 191221B
	Buckley, D A H 13,14; Bagnulo, S 15; Britto, R J 9; Mao JR(毛基荣)6,7,8; Kann, D A 5; Cooper, J 9; Lipunov, V 26,27; Hewitt, D M 13,14; Razzaque, S 25; Kuin, N P M 24
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2021-08-11
卷号	506 期号:3 页码:4621-4631
关键词	magnetic fields gamma-ray bursts high energy astrophysics polarimetry shocks jets
ISSN号	0035-8711
DOI	10.1093/mnras/stab1791
产权排序	第5完成单位
文献子类	Article
英文摘要	We report on results of spectropolarimetry of the afterglow of the long gamma-ray burst GRB 191221B, obtained with SALT/RSS and VLT/FORS2, as well as photometry from two telescopes in the MASTER Global Robotic Network, at the MASTER-SAAO (South Africa) and MASTER-OAFA (Argentina) stations. Prompt optical emission was detected by MASTER-SAAO 38 s after the alert, which dimmed from a magnitude (white-light) of similar to 10-16.2 mag over a period of similar to 10 ks, followed by a plateau phase lasting similar to 10 ks and then a decline to similar to 18 mag after 80 ks. The light curve shows complex structure, with four or five distinct breaks in the power-law decline rate. SALT/RSS linear spectropolarimetry of the afterglow began similar to 2.9 h after the burst, during the early part of the plateau phase of the light curve. Absorption lines seen at similar to 6010 and 5490 angstrom are identified with the Mg ii 2799 angstrom line from the host galaxy at z = 1.15 and an intervening system located at z = 0.96. The mean linear polarization measured over 3400-8000 angstrom was similar to 1.5 per cent and the mean equatorial position angle (theta) was similar to 65 degrees. VLT/FORS2 spectropolarimetry was obtained similar to 10 h post-burst, during a period of slow decline (alpha = -0.44), and the polarization was measured to be p = 1.2 per cent and theta = 60 degrees. Two observations with the MeerKAT radio telescope, taken 30 and 444 d after the GRB trigger, detected radio emission from the host galaxy only. We interpret the light curve and polarization of this long GRB in terms of a slow-cooling forward shock.
学科主题	天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学
URL标识	查看原文
出版地	GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
资助项目	SALT under programme[2018-2-LSP-001] ; MNiSWMinistry of Science and Higher Education, Poland[DIR/WK/2016/07] ; National Research Foundation (NRF) of South AfricaNational Research Foundation - South Africa ; South African Research Chairs Initiative[64789] ; Department of Science and Innovation ; NRF[111749] ; University of Johannesburg Research Council ; Spanish National Research ProjectSpanish Government[RTI2018-098104-J-I00] ; UK Space Agency ; State University Development Program ; RFBR grantRussian Foundation for Basic Research (RFBR)[19-29-11011] ; ESO programme[0104.D-0600(C)]
WOS关键词	LINEAR-POLARIZATION ; REVERSE SHOCK ; OPTICAL AFTERGLOW ; MAGNETIC-FIELDS ; RADIO ; EMISSION ; PROMPT ; MODELS ; LIGHT ; POLARIMETRY
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000767866400001
资助机构	SALT under programme[2018-2-LSP-001] ; MNiSWMinistry of Science and Higher Education, Poland[DIR/WK/2016/07] ; National Research Foundation (NRF) of South AfricaNational Research Foundation - South Africa ; South African Research Chairs Initiative[64789] ; Department of Science and Innovation ; NRF[111749] ; University of Johannesburg Research Council ; Spanish National Research ProjectSpanish Government[RTI2018-098104-J-I00] ; UK Space Agency ; State University Development Program ; RFBR grantRussian Foundation for Basic Research (RFBR)[19-29-11011] ; ESO programme[0104.D-0600(C)]
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ynao.ac.cn/handle/114a53/24789]
专题	星系类星体研究组
通讯作者	Buckley, D A H
作者单位	1.Brera Astronomical Observatory, Via Bianchi 46, I-23807 Merate(LC), Italy; 2.CAS Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China 3.San Juan National University, OAFA, Casilla de Correo 49, 5400 San Juan, Argentina; 4.Observatorio Astronomico Felix Aguilar (OAFA), Avda Benavides s/n, Rivadavia, El Leonsito, 5413, Argentina; 5.Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía s/n, E-18008 Granada, Spain; 6.Key Laboratory for the Structure and Evolution of CelestialObjects, Chinese Academy of Sciences, 650011 Kunming, China; 7.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, 100012 Beijing, China; 8.Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, Yunnan Province, China; 9.Department of Physics, University of the Free State, PO Box 339, Bloemfontein 9300, South Africa; 10.Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, UK;
推荐引用方式 GB/T 7714	Buckley, D A H,Bagnulo, S,Britto, R J,et al. Spectropolarimetry and photometry of the early afterglow of the gamma-ray burst GRB 191221B[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,506(3):4621-4631.
APA	Buckley, D A H.,Bagnulo, S.,Britto, R J.,Mao JR.,Kann, D A.,...&Xu, D.(2021).Spectropolarimetry and photometry of the early afterglow of the gamma-ray burst GRB 191221B.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,506(3),4621-4631.
MLA	Buckley, D A H,et al."Spectropolarimetry and photometry of the early afterglow of the gamma-ray burst GRB 191221B".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 506.3(2021):4621-4631.