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

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cris.lastimport.scopus2024-02-12T20:53:23Z
dc.abstract.enThe ejecta composition is an open question in gamma-ray bursts (GRB) physics. Some GRBs possess a quasi-thermal spectral component in the time-resolved spectral analysis, suggesting a hot fireball origin. Others show a featureless non-thermal spectrum known as the "Band" function, consistent with a synchrotron radiation origin and suggesting that the jet is Poynting-flux-dominated at the central engine and likely in the emission region as well. There are also bursts showing a sub-dominant thermal component and a dominant synchrotron component suggesting a likely hybrid jet composition. Here we report an extraordinarily bright GRB 160625B, simultaneously observed in gamma-rays and optical wavelengths, whose prompt emission consists of three isolated episodes separated by long quiescent intervals, with the durations of each "sub-burst" being ∼ 0.8 s, 35 s, and 212 s, respectively. Its high brightness (with isotropic peak luminosity Lp,iso∼4×1053 erg/s) 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.affiliationUniwersytet Warszawski
dc.contributor.authorOpiela, Rafał
dc.contributor.authorŻarnecki, Aleksander
dc.contributor.authorZadrożny, Adam
dc.contributor.authorMankiewicz, Lech
dc.contributor.authorĆwiek, Arkadiusz
dc.date.accessioned2024-01-26T11:05:19Z
dc.date.available2024-01-26T11:05:19Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.number1
dc.description.volume2
dc.identifier.doi10.1038/S41550-017-0309-8
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123713
dc.identifier.weblinkhttps://www.nature.com/articles/s41550-017-0309-8
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofNature Astronomy
dc.relation.pages69-75
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleTransition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B
dc.typeJournalArticle
dspace.entity.typePublication