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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 |