Coherent Synchrotron Radiation of Gamma-Ray Bursts

2005 ◽  
pp. 309-318
Author(s):  
K.G. Gainullin ◽  
A.M. Zlobin
Keyword(s):  
Synchrotron Radiation ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Coherent Synchrotron Radiation

Coherent Synchrotron Radiation of Gamma-Ray Bursts

2005 ◽  
Vol 297 (1-4) ◽  
pp. 309-318
Author(s):  
K. G. Gainullin ◽  
A. M. Zlobin
Keyword(s):  
Synchrotron Radiation ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Coherent Synchrotron Radiation

scholarly journals Prompt optical emission as a signature of synchrotron radiation in gamma-ray bursts

2019 ◽  
Vol 628 ◽  
pp. A59 ◽  
Author(s):  
G. Oganesyan ◽  
L. Nava ◽  
G. Ghirlanda ◽  
A. Melandri ◽  
A. Celotti
Keyword(s):  
Synchrotron Radiation ◽  
Parameter Space ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Spectral Shape ◽  
Low Energy ◽  
Optical Observations ◽  
X Rays ◽  
Thermal Component ◽  
Prompt Emission

Information on the spectral shape of prompt emission in gamma-ray bursts (GRB) is mostly available only at energies ≳10 keV, where the main instruments for GRB detection are sensitive. The origin of this emission is still very uncertain because of the apparent inconsistency with synchrotron radiation, which is the most obvious candidate, and the resulting need for considering less straightforward scenarios. The inclusion of data down to soft X-rays (∼0.5 keV), which are available only in a small fraction of GRBs, has firmly established the common presence of a spectral break in the low-energy part of prompt spectra, and even more importantly, the consistency of the overall spectral shape with synchrotron radiation in the moderately fast-cooling regime, the low-energy break being identified with the cooling frequency. In this work we further extend the range of investigation down to the optical band. In particular, we test the synchrotron interpretation by directly fitting a theoretically derived synchrotron spectrum and making use of optical to gamma-ray data. Secondly, we test an alternative model that considers the presence of a black-body component at ∼keV energies, in addition to a non-thermal component that is responsible for the emission at the spectral peak (100 keV–1 MeV). We find that synchrotron radiation provides a good description of the broadband data, while models composed of a thermal and a non-thermal component require the introduction of a low-energy break in the non-thermal component in order to be consistent with optical observations. Motivated by the good quality of the synchrotron fits, we explore the physical parameter space of the emitting region. In a basic prompt emission scenario we find quite contrived solutions for the magnetic field strength (5 G < B′< 40 G) and for the location of the region where the radiation is produced (Rγ >  1016 cm). We discuss which assumptions of the basic model would need to be relaxed in order to achieve a more natural parameter space.

scholarly journals Electron Spectrum for the Prompt Emission of Gamma-Ray Bursts in the Synchrotron Radiation Scenario

2021 ◽  
Vol 911 (1) ◽  
pp. 13
Author(s):  
Kuan Liu ◽  
Da-Bin Lin ◽  
Jing Li ◽  
Yu-Fei Li ◽  
Rui-Jing Lu ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Electron Spectrum ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Prompt Emission

Nonthermal synchrotron radiation and pair annihilation in gamma-ray bursts

1989 ◽  
Vol 347 ◽  
pp. 1128 ◽  
Author(s):  
Robert Preece ◽  
Alice K. Harding
Keyword(s):  
Synchrotron Radiation ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Pair Annihilation

Elderly probe nails gamma-ray bursts

Nature ◽  
2005 ◽  
Author(s):  
Mark Peplow
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts

On the nature of cosmic gamma-ray bursts

1996 ◽  
Vol 166 (7) ◽  
pp. 743-762 ◽  
Author(s):  
B.I. Luchkov ◽  
I.G. Mitrofanov ◽  
I.L. Rozental'
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts

Cosmic gamma-ray bursts and soft gamma-repeaters — observations and modeling of extreme astrophysical phenomena (100th anniversary of the Ioffe Institute)

2018 ◽  
Vol 189 (08) ◽  
pp. 785-802 ◽  
Author(s):  
Rafail L. Aptekar ◽  
Andrei M. Bykov ◽  
Sergei V. Golenetskii ◽  
Dmitrii D. Frederiks ◽  
Dmitry S. Svinkin ◽  
...  
Keyword(s):  
Gamma Ray ◽  
100Th Anniversary ◽  
Gamma Ray Bursts ◽  
Soft Gamma Repeaters ◽  
Ioffe Institute ◽  
Astrophysical Phenomena
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