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Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B

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dc.contributor.author Moskvitin A.
dc.contributor.author Fatkhullin T.
dc.contributor.author Sokolov V.
dc.contributor.author Valeev A.
dc.contributor.author Jeong S.
dc.contributor.author Park I.
dc.contributor.author Caballero-García M.
dc.contributor.author Cunniffe R.
dc.contributor.author Tello J.
dc.contributor.author Ferrero P.
dc.contributor.author Pandey S.
dc.contributor.author Jelínek M.
dc.contributor.author Peng F.
dc.contributor.author Sánchez-Ramrez R.
dc.contributor.author Castellón A.
dc.date.accessioned 2019-01-22T20:53:40Z
dc.date.available 2019-01-22T20:53:40Z
dc.date.issued 2018
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/149304
dc.description.abstract © 2017 The Author(s). 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,iso ≈ 4 × 1053 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.
dc.title Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B
dc.type Article
dc.relation.ispartofseries-issue 1
dc.relation.ispartofseries-volume 2
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 69
dc.source.id SCOPUS-2018-2-1-SID85040326232

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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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