Multipulse Fermi Gamma-Ray Bursts. I. Evidence of the Transition from Fireball to Poynting-flux-dominated Outflow

Li, Liang

doi:10.3847/1538-4365/ab1b78

Cited by 47 publications

(32 citation statements)

References 138 publications

(200 reference statements)

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“…Very recently, an interesting work on multiple pulses of Fermi/GBM GRBs had been done by Li (2019) to search for an evidence of the transition from fireball to Poynting-flux-dominated outflow in the GRB160602Blike sample. As a result, he found 9 out of 41 GBM bursts to be coincident with the case.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…The reason is that the early and late dominant radiation mechanisms are generally the thermal emissions from the photospheres and the non-thermal (synchrotron) emissions from the Poynting fluxes. According to Li (2019), the differences between the Ml-DPs and other sGRBs with the SPs and the Mt-DPs can be easily explained if the Ml-DPs are assumed to occur the transition process from fireball to Poyntingflux-dominated outflow. Based on the above discussions, we believe that the observed profiles of GRB pulses are affected by not only the geometry, the dynamics and the radiative cooling of outflows, but also the detailed radiation mechanisms.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

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Properties of Short GRB Pulses in the Fourth BATSE Catalog: Implications for the Structure and Evolution of the Jetted Outflows

X.J.Li

Z.B.Zhang

C.T.Zhang

et al. 2020

ApJ

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Considering the shortage of comparative studies on pulse temporal characteristics between singlepeaked short gamma-ray bursts (sGRBs) and double-peaked sGRBs, we examine the pulse properties of a sample of 100 BATSE sGRBs using the BATSE Time-Tagged Event (TTE) data with a 5-ms resolution. 243 individual pulses of the single-peaked, double-peaked and triple-peaked sGRBs are fitted to get their statistical properties such as the pulse asymmetry, amplitude, peak time, and pulse width, etc. For the double-peaked sGRBs, according to the overlapping ratio between two adjacent peaks, we first define two kinds of double-peaked sGRBs as M-loose and M-tight types and find that most of the first pulses are similar to the single-peaked ones. We study the dependence of the Full Width at Half Maximum (FWHM) on the photon energy among different energy bands. Interestingly, it is found that a power-law relation with an index of -0.4 does exist between the FWHM and the photon energy for the single-and double-peaked sGRBs. More interestingly, we notice that the powerlaw relation with a positive index also exist for several special short bursts. In view of the three typical timescales of pulses, namely the angular spreading timescale, the dynamic timescale, and the cooling timescale, we propose that the diverse power-law indexes together with the profile evolution of GRB pulse can be used as an effective probe to diagnose the structure and evolution of the relativistically jetted outflows.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Conclusion and Discussionmentioning

confidence: 99%

Properties of Short GRB Pulses in the Fourth BATSE Catalog: Implications for the Structure and Evolution of the Jetted Outflows

X.J.Li

Z.B.Zhang

C.T.Zhang

et al. 2020

ApJ

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“…In the case of GRB 160625B, the initial pulse was found to possess a strong thermal component and the second emission pulse that was observed after a long quiescent period of ∼ 180 s was found to possess a non-thermal spectrum, best modelled using a Band function alone. In Zhang et al (2018) and Li (2019), these spectral observations were used to infer that the burst has undergone a transition from a pure fireball to Poynting flux dominated outflow.…”

Section: Jet Composition: Baryon Dominated Outflow With Mild Magnetismentioning

confidence: 99%

Spectropolarimetric analysis of prompt emission of GRB 160325A: jet with evolving environment of internal shocks

Sharma

Iyyani

Bhattacharya

et al. 2020

Monthly Notices of the Royal Astronomical Society

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GRB 160325A is the only bright burst detected by AstroSat CZT Imager in its primary field of view to date. In this work, we present the spectral and polarimetric analysis of the prompt emission of the burst using AstroSat, Fermi and Niel Gehrels Swift observations. The prompt emission consists of two distinct emission episodes separated by a few seconds of quiescent/ mild activity period. The first emission episode shows a thermal component as well as a low polarisation fraction of PF < 37 % at 1.5 σ confidence level. On the other hand, the second emission episode shows a non-thermal spectrum and is found to be highly polarised with PF > 43 % at 1.5σ confidence level. We also study the afterglow properties of the jet using Swift/XRT data. The observed jet break suggests that the jet is pointed towards the observer and has an opening angle of 1.2 • for an assumed redshift, z = 2. With composite modelling of polarisation, spectrum of the prompt emission and the afterglow, we infer that the first episode of emission originates from the photosphere with localised dissipation happening below it, and the second from the optically thin region above the photosphere. The photospheric emission is generated mainly by inverse Compton scattering, whereas the emission in the optically thin region is produced by the synchrotron process. The low radiation efficiency of the burst suggests that the outflow remains baryonic dominated throughout the burst duration with only a subdominant Poynting flux component, and the kinetic energy of the jet is likely dissipated via internal shocks which evolves from an optically thick to optically thin environment within the jet.

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“…We note that in the cases of a hot fireball jet characterised by a quasi-thermal Planck-like spectrum (e.g. GRB 090902B 4 ), a Poynting-flux-dominated outflow characterised by a Band (or cutoff power-law)-only function (e.g., GRB 080916C 33 and GRB 130427A 34 ), a hybrid jet characterised by either a twocomponent spectral scenario (composed of a non-thermal component and a thermal component simultaneously, e.g., GRB 110721A 21,35 ), or a transition from fireball to Poynting-flux-dominated outflow within a single GRB (e.g., GRB 160625B [36][37][38] ), have been observed in the past. However, GRB 190114C presented unique information not available before.…”

Section: Methodsmentioning

confidence: 99%

A Cosmological Fireball with Thirty-Percent Gamma-Ray Radiative Efficiency

Wang

Ryde

et al. 2021

Preprint

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Gamma-ray bursts (GRBs) are the most powerful explosions in the universe. The composition of the jets is, however, subject to debate\cite{Peer2015,Zhang2018}. Whereas the traditional model invokes a relativistic matter-dominated fireball with a bright photosphere emission component\cite{Meszaros2000}, the lack of the detection of such a component in some GRBs\cite{Abdo2009} has led to the conclusion that GRB jets may be Poynting-flux-dominated\cite{Zhang2009}. Furthermore, how efficiently the jet converts its energy to radiation is poorly constrained. A definitive diagnosis of the GRB jet composition and measurement of GRB radiative efficiency requires high-quality prompt emission and afterglow data, which has not been possible with the sparse observations in the past. Here we report a comprehensive temporal and spectral analysis of the TeV-emitting bright GRB 190114C. Its fluence is one of the highest of all GRBs detected so far, which allows us to perform a high-significance study on the prompt emission spectral properties and their variations down to a very short timescale of about 0.1 s. We identify a clear thermal component during the first two prompt emission episodes, which is fully consistent with the prediction of the fireball photosphere model. The third episode of the prompt emission is consistent with synchrotron radiation from the deceleration of the fireball. This allows us to directly dissect the fireball energy budget in a parameter-independent manner\cite{Zhang2021} and robustly measure a nearly $30\%$ radiative efficiency for this GRB. The afterglow microphysics parameters can be also well constrained from the data. GRB 190114C, therefore, exhibits the evolution of a textbook-version relativistic fireball, suggesting that fireballs can indeed power at least some GRBs with high efficiency.

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Multipulse Fermi Gamma-Ray Bursts. I. Evidence of the Transition from Fireball to Poynting-flux-dominated Outflow

Cited by 47 publications

References 138 publications

Properties of Short GRB Pulses in the Fourth BATSE Catalog: Implications for the Structure and Evolution of the Jetted Outflows

Properties of Short GRB Pulses in the Fourth BATSE Catalog: Implications for the Structure and Evolution of the Jetted Outflows

Spectropolarimetric analysis of prompt emission of GRB 160325A: jet with evolving environment of internal shocks

A Cosmological Fireball with Thirty-Percent Gamma-Ray Radiative Efficiency

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