Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B
Zhang, B. -B.1,2,3; Zhang, B.4,5,6; Castro-Tirado, A. J.1,7; Dai, Z. G.2,8; Tam, P. -H. T.9; Wang, X. -Y.2,8; Hu, Y. -D.1,10; Karpov, S.11,12; Pozanenko, A.13,14,15; Zhang, F. -W.16; Mazaeva, E.13; Minaev, P.13; Volnova, A.13; Oates, S.17; Gao, H.18; Wu, X. -F19,20,21; Shao, L.19,22; Tang, Q. -W.23; Beskin, G.11,12; Biryukov, A.12,24; Bondar, S.25; Ivanov, E.25; Katkova, E.25; Orekhova, N.25; Perkov, A.25; Sasyuk, V.12; Mankiewicz, L.26; Zarnecki, A. F.27; Cwiek, A.28; Opiela, R.26; Zadrozny, A.28; Aptekar, R.29; Frederiks, D.29; Svinkin, D.29; Kusakin, A.30; Inasaridze, R.31; Burhonov, O.32; Rumyantsev, V.33; Klunko, E.34; Moskvitin, A.11; Fatkhullin, T.11; Sokolov, V. V.11; Valeev, A. F.11,12; Jeong, S.1,35; Park, I. H.35; Caballero-Garcia, M. D.36; Cunniffe, R.1; Tello, J. C.1; Ferrero, P.1; Pandey, S. B.37; Jelinek, M.36; Peng, F. K.38; Sanchez-Ramrez, R.1; Castellon, A.39
Source PublicationNATURE ASTRONOMY

The ejecta composition is an open question in gamma-ray burst (GRB) physics(1). Some GRBs possess a quasi-thermal spectral component in the time-resolved spectral analysis(2), suggesting a hot fireball origin. Others show a featureless non-thermal spectrum known as the Band function(3-5), consistent with a synchrotron radiation origin(5,6) and suggesting that the jet is Poynting-flux dominated at the central engine and probably in the emission region as well(7,8). There are also bursts showing a sub-dominant thermal component and a dominant synchrotron component(9), suggesting a probable hybrid jet composition(10). Here, we report an extraordinarily bright GRB 160625B, simultaneously observed in gamma-ray and optical wavelengths, whose prompt emission consists of three isolated episodes separated by long quiescent intervals, with the durations of each sub-burst being approximately 0.8 s, 35 s and 212 s, respectively. Its high brightness (with isotropic peak luminosity L-p,L-iso approximate to 4 x 10(53) erg s(-1)) allows us to conduct detailed time-resolved spectral analysis in each episode, from precursor to main burst and to extended emission. The spectral properties of the first two sub-bursts are distinctly different, allowing us to observe the transition from thermal to non-thermal radiation between well-separated emission episodes within a single GRB. Such a transition is a clear indication of the change of jet composition from a fireball to a Poynting-flux-dominated jet.

Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000423480900023
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Document Type期刊论文
Corresponding AuthorZhang, B. -B.; Zhang, B.
Affiliation1.CSIC, IAA, POB 03004, Granada, Spain
2.Nanjing Univ, Sch Astron & Space Sci, Nanjing, Jiangsu, Peoples R China
3.Scientist Support LLC, Madison, AL 35758 USA
4.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
5.Peking Univ, Sch Phys, Dept Astron, Beijing, Peoples R China
6.Peking Univ, Kavli Inst Astron Astrophys, Beijing, Peoples R China
7.Univ Malaga, Escuela Ingn, Dept Ingn Sistemas & Automat, Malaga, Spain
8.Nanjing Univ, Minist Educ, Key Lab Modern Astron Astrophys, Nanjing, Jiangsu, Peoples R China
9.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai, Peoples R China
10.Univ Granada, Fac Ciencias, Campus Fuentenueva S-N, Granada, Spain
11.Russian Acad Sci, Special Astrophys Observ, Nizhniy Arkhyz, Russia
12.Kazan Fed Univ, Kazan, Russia
13.Russian Acad Sci, Space Res Inst, Moscow, Russia
14.Natl Res Nucl Univ, MEPhI Moscow Engn Phys Inst, Moscow, Russia
15.Natl Res Univ Higher Sch Econ, Moscow, Russia
16.Guilin Univ Technol, Coll Sci, Guilin, Peoples R China
17.Univ Warwick, Dept Phys, Coventry, W Midlands, England
18.Beijing Normal Univ, Dept Astron, Beijing, Peoples R China
19.Chinese Acad Sci, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China
20.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei, Anhui, Peoples R China
21.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing, Jiangsu, Peoples R China
22.Hebei Normal Univ, Dept Space Sci & Astron, Shijiazhuang, Hebei, Peoples R China
23.Nanchang Univ, Dept Phys, Nanchang, Jiangxi, Peoples R China
24.Moscow MV Lomonosov State Univ, Moscow, Russia
25.Res & Prod Corp Precis Syst & Instruments, Nizhniy Arkhyz, Russia
26.Ctr Theoret Phys PAS, Warsaw, Poland
27.Univ Warsaw, Fac Phys, Warsaw, Poland
28.Natl Ctr Nucl Res, Warsaw, Poland
29.Ioffe Inst, St Petersburg, Russia
30.Fesenkov Astrophys Inst, Alma Ata, Kazakhstan
31.Ilia State Univ, Kharadze Abastumani Astrophys Observ, Tbilisi, Rep of Georgia
32.Ulugh Beg Astron Inst, Tashkent, Uzbekistan
33.Crimean Astrophys Observ, Nauchny, Crimea, Russia
34.Inst Solar Terr Phys, POB 291, Irkutsk, Russia
35.Sungkyunkwan Univ SKKU, Dept Phys, Suwon, South Korea
36.Acad Sci, Astron Inst, Prague, Czech Republic
37.ARIES, Manora Peak, Nainital, India
38.Guizhou Normal Univ, Sch Phys & Elect Sci, Guiyang, Guizhou, Peoples R China
39.Univ Malaga, Fac Ciencias, Dept Algebra Geometria & Topol, Malaga, Spain
Recommended Citation
GB/T 7714
Zhang, B. -B.,Zhang, B.,Castro-Tirado, A. J.,et al. Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B[J]. NATURE ASTRONOMY,2018,2(1):69-75.
APA Zhang, B. -B..,Zhang, B..,Castro-Tirado, A. J..,Dai, Z. G..,Tam, P. -H. T..,...&Castellon, A..(2018).Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B.NATURE ASTRONOMY,2(1),69-75.
MLA Zhang, B. -B.,et al."Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B".NATURE ASTRONOMY 2.1(2018):69-75.
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