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Transition from fireball to Poynting-flux-dominated outflow in three-episode GRB 160625B [submitted version]
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(2016) Transition from fireball to Poynting-flux-dominated outflow in three-episode GRB 160625B [submitted version]. ArXiv e-prints . (Unpublished)
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Abstract
The ejecta composition of gamma-ray bursts (GRBs) is an open question in GRB physics. Some GRBs possess a quasi-thermal spectral component in the time-resolved spectral analysis, suggesting a hot fireball origin. Some others show an essentially feature-less non-thermal spectrum known as the "Band" function, which can be interpreted as synchrotron radiation in an optically thin region, suggesting a Poynting-flux-dominated jet composition. Here we report an extraordinarily bright GRB 160625B, simultaneously observed in gamma-rays and optical wavelengths, whose prompt emission consists of three dramatically different isolated episodes separated by long quiescent intervals, with the durations of each "sub-burst" being ∼ 0.8 s, 35 s, and 212 s, respectively. The high brightness (with isotropic peak luminosity Lp,iso∼4×1053 erg/s) of this GRB allows us to conduct detailed time-resolved spectral analysis in each episode, from precursor to the main burst and extended emission. Interestingly, the spectral properties of the first two sub-bursts are distinctly different, which allow us for the first time to observe the transition from thermal to non-thermal radiation in 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.
Item Type: | Submitted Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Gamma ray bursts , Synchrotron radiation | ||||
Journal or Publication Title: | ArXiv e-prints | ||||
Official Date: | 3 December 2016 | ||||
Dates: |
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Status: | Not Peer Reviewed | ||||
Publication Status: | Unpublished | ||||
Funder: | The Spanish Research Project (SRP), United States. National Aeronautics and Space Administration (NASA), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), China Scholarship Council (CSC), Kazanskiĭ (Privolzhskiĭ) federalʹnyĭ universitet, Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR), Rustaveli Foundation | ||||
Grant number: | AYA 2012-39727-C03-01, AYA2015-71718-R (SRP), NNX14AF85G, NNX15AK85G (NASA), 11573014, 11603003, 11625312, 2014CB84580, U1331101 (NSFC), Grant No.20140666001 (CSC), 15-12-3001, 14-50-00043. (RFBR), RUSTAVELI FR/379/6- 300/14 (Rustaveli Foundation) | ||||
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