Evidence of an Internal Dissipation Origin for the High-energy Prompt Emission of GRB 170214A

Tang, Qing-Wen; Wang, Xiangyu; Liu, Ruo-Yu

doi:10.3847/1538-4357/aa7a58

Cited by 14 publications

(6 citation statements)

References 25 publications

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“…The onset of the LAT detection happened during the prompt phase, although delayed approximately 60 s with respect to the GBM trigger. Given that a similar short-time variability was observed in the GBM and LAT energy bands, an internal (prompt-phase) origin for the HE emission was proposed in Tang et al (2017). In terms of energetics and (preliminary) intrinsic peak energy, the burst is also similar to the recently observed GRB 221009A (Frederiks et al 2022;Lesage et al 2022;Ursi et al 2022).…”

Section: Multipulse Burst With Short-time Variability (Mp E545 )supporting

confidence: 63%

Multicollision Internal Shock Lepto-hadronic Models for Energetic Gamma-Ray Bursts (GRBs)

Rudolph

Πετροπούλου

Bošnjak

et al. 2023

ApJ

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For a subpopulation of energetic gamma-ray bursts (GRBs), a moderate baryonic loading may suffice to power ultra-high-energy cosmic rays (UHECRs). Motivated by this, we study the radiative signatures of cosmic-ray protons in the prompt phase of energetic GRBs. Our framework is the internal shock model with multicollision descriptions of the relativistic ejecta (with different emission regions along the jet), plus time-dependent calculations of photon and neutrino spectra. Our GRB prototypes are motivated by Fermi-Large Area Telescope-detected GRBs (including GRB 221009A) for which further, owing to the large energy flux, neutrino nonobservation of single events may pose a strong limit on the baryonic loading. We study the feedback of protons on electromagnetic spectra in synchrotron- and inverse Compton-dominated scenarios to identify the multiwavelength signatures, to constrain the maximally allowed baryonic loading, and to point out the differences between hadronic and inverse Compton signatures. We find that hadronic signatures appear as correlated flux increases in the optical-UV to soft X-ray and GeV–TeV gamma-ray ranges in the synchrotron scenarios, whereas they are difficult to identify in inverse Compton-dominated scenarios. We demonstrate that baryonic loadings around 10, which satisfy the UHECR energetic requirements, do not distort the predicted photon spectra in the Fermi Gamma-Ray Burst Monitor range and are consistent with constraints from neutrino data if the collision radii are large enough (i.e., the time variability is not too short). It therefore seems plausible that under the condition of large dissipation radii a population of energetic GRBs can be the origin of the UHECRs.

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Section: Multipulse Burst With Short-time Variability (Mp E545 )supporting

confidence: 63%

Multicollision Internal Shock Lepto-hadronic Models for Energetic Gamma-Ray Bursts (GRBs)

Rudolph

Πετροπούλου

Bošnjak

et al. 2023

ApJ

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“…In general, the paucity of multi-GeV photons makes it difficult to assess the importance of variability and temporal correlations with the emissions at lower energies. The latter implies that common features of signals in the sub-MeV and multi-GeV spectral bands could be established within some time intervals [58] that exceed substantially the time resolution of the detectors. This ultimately implies an uncertainty whose neglect can lead to an overstated assessment of the significance of the measurement obtained on the basis of an analysis [38][39][40][41] cross-correlating sub-MeV and multi-GeV photons.…”

Section: Fermi-latmentioning

confidence: 99%

Robust constraint on Lorentz violation using Fermi-LAT gamma-ray burst data

et al. 2019

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Models of quantum gravity suggest that the vacuum should be regarded as a medium with quantum structure that may have non-trivial effects on photon propagation, including the violation of Lorentz invariance. Fermi Large Area Telescope (LAT) observations of gammaray bursts (GRBs) are sensitive probes of Lorentz invariance, via studies of energy-dependent timing shifts in their rapidly-varying photon emissions. In this paper we analyze the Fermi-LAT measurements of high-energy gamma rays from GRBs with known redshifts, allowing for the possibility of energy-dependent variations in emission times at the sources as well as a possible non-trivial refractive index in vacuo for photons. We use statistical estimators based on the irregularity, kurtosis and skewness of bursts that are relatively bright in the 100 MeV to multi-GeV energy band to constrain possible dispersion effects during propagation. We find that the energy scale characterizing a linear energy dependence of the refractive index should exceed a few ×10 17 GeV, and we estimate the sensitivity attainable with additional future sources to be detected by Fermi-LAT.

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“…The dissipation mechanism, e.g., internal shocks (Paczynski & Xu 1994;Tang et al 2017), magnetic reconnection (Giannios & Spruit 2005;Giannios 2006), or external shocks (Meszaros & Rees 1993;Dermer & Mitman 1999) for the non-thermal emission is still uncertain. However, it is clear that the thermal component originates from the photosphere.…”

Section: Photosphere Emission Component and Determination Of The Outfmentioning

confidence: 99%

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

2019

ApJS

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The composition of jet is still an unsolved problem in gamma-ray bursts (GRBs). Several previous studies have suggested that the prompt emission spectrum of GRBs is likely to consist of a few components which may arise from different jet composition. Here, we present a systematic analysis to search for the GRBs which seem to show the transition from a fireball to the Poynting-flux-dominated outflow between well-separated pulses within a single burst, like the GRB 160626B, using GBM (the Gamma-ray Burst Monitor) data of the Fermi satellite. We obtain 43 GRBs with clear multiple pulses, and find that 9/43 (21%) bursts may exhibit such a transition based on the timeintegrated spectral analysis. We then select further 4 bursts with the data of adequate quality to perform a detailed time-resolved spectral analysis, and find that in 3 bursts the thermal-like pulse is a precursor. Furthermore, based on the time-resolved spectra, we constrain the outflow properties for those thermal pulses, and find them consistent with the typical properties of the photosphere emission. Also, the later pulses with the softer low-energy spectral index are compatible with the optically-thin synchrotron emission model. Our analysis indicates that a good fraction of the multi-pulse Fermi bursts may obtain the transition from fireball to the Poynting-Flux-Dominated outflow.

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Evidence of an Internal Dissipation Origin for the High-energy Prompt Emission of GRB 170214A

Cited by 14 publications

References 25 publications

Multicollision Internal Shock Lepto-hadronic Models for Energetic Gamma-Ray Bursts (GRBs)

Multicollision Internal Shock Lepto-hadronic Models for Energetic Gamma-Ray Bursts (GRBs)

Robust constraint on Lorentz violation using Fermi-LAT gamma-ray burst data

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

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