Reconciling observed gamma-ray burst prompt spectra with synchrotron radiation?

@article{Daigne2010ReconcilingOG,
  title={Reconciling observed gamma-ray burst prompt spectra with synchrotron radiation?},
  author={Fr'ed'eric Daigne and Ž. Bo{\vs}njak and G. Dubus Institut d'Astrophysique de Paris and UMR7095 Cnrs and Aim IrfuService d'Astrophysique and Laboratoire d'Astrophysique de Grenoble and Umr 5571 Universit'e Joseph Fourier-CNRS},
  journal={Astronomy and Astrophysics},
  year={2010},
  volume={526}
}
Context. Gamma-ray burst emission in the prompt phase is often interpreted as synchrotron radiation from high-energy electrons accelerated in internal shocks. Fast synchrotron cooling of a power-law distribution of electrons leads to the prediction that the slope below the spectral peak has a photon index α = −3/ 2( N(E) ∝ E α ). However, this differs significantly from the observed median value α ≈− 1. This discrepancy has been used to argue against this scenario. Aims. We quantify the… Expand
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  • Physics
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References

SHOWING 1-10 OF 70 REFERENCES
Gamma-ray bursts from synchrotron self-Compton emission
The emission mechanism of gamma-ray bursts (GRBs) is still a matter of debate. The standard synchrotron energy spectrum of cooling electrons F E E -1/2 is much too soft to account for the majority ofExpand
Prompt high-energy emission from gamma-ray bursts in the internal shock model
Context. Gamma-ray bursts (GRB) are powerful, short duration events with a spectral luminosity peaking in the keV-MeV (BATSE) range. The prompt emission is thought to arise from electrons acceleratedExpand
Synchrotron Radiation as the Source of Gamma-Ray Burst Spectra
We investigate synchrotron emission models as the source of gamma-ray burst (GRB) spectra. We show that including the possibility for synchrotron self-absorption, a "smooth cutoff" to the electronExpand
Synchrotron Emission in Small-Scale Magnetic Fields as a Possible Explanation for Prompt Emission Spectra of Gamma-Ray Bursts
Synchrotron emission is believed to be a major radiation mechanism during gamma-ray bursts' (GRBs) prompt emission phase. A significant drawback of this assumption is that the theoretical predictedExpand
Constraints on the emission mechanisms of gamma‐ray bursts
ABSTRACT If the emission of gamma–ray bursts were due to the synchrotron process in the stan-dard internal shock scenario, then the typical observed spectrum should have a slopeF ν ∝ν −1/2 , whichExpand
A Study of Prompt Emission Mechanisms in Gamma-Ray Bursts
The principal paradigm for the generation of the nonthermal particles that are responsible for the prompt emission of gamma-ray bursts invokes diffusive shock acceleration at shocks internal to theExpand
GRB 080916C: On the Radiation Origin of the Prompt Emission from keV/MeV TO GeV
Fermi observations of high-energy gamma-ray emission from GRB 080916C shows that its spectrum is consistent with the band function from MeV to tens of GeV. Assuming one single emission mechanismExpand
Cooling Timescales and Temporal Structure of Gamma-Ray Bursts
A leading mechanism for producing cosmological gamma-ray bursts (GRBs) is via ultrarelativistic particles in an expanding fireball. The kinetic energy of the particles is converted into thermalExpand
Slow Heating Model of Gamma-ray Burst: Photon Spectrum and Delayed Emission
We propose a new mechanism for the prompt emission of gamma-ray burst. In our model, electrons are continuously accelerated in the post-shock region via plasma turbulence. Using the Monte CarloExpand
On the Synchrotron Self-Compton Emission from Relativistic Shocks and Its Implications for Gamma-Ray Burst Afterglows
We consider the effects of inverse Compton scattering of synchrotron photons from relativistic electrons in ?-ray burst (GRB) afterglows. We compute the spectrum of the inverse Compton emission andExpand
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