INVERSE COMPTON EMISSION FROM THE PROMPT OPTICAL EMISSION REGION IN GAMMA-RAY BURSTS

2009 ◽  
Vol 708 (2) ◽  
pp. 1357-1365 ◽  
Author(s):  
X. H. Zhao ◽  
Z. G. Dai ◽  
T. Liu ◽  
J. M. Bai ◽  
Z. Y. Peng
Keyword(s):  
Gamma Ray ◽  
Optical Emission ◽  
Gamma Ray Bursts ◽  
Emission Region ◽  
Inverse Compton

GAMMA-RAY BURSTS AS VHE-UHE SOURCES

2008 ◽  
Vol 17 (09) ◽  
pp. 1319-1332
Author(s):  
PETER MÉSZÁROS
Keyword(s):  
Cosmic Rays ◽  
Gamma Rays ◽  
Lower Energy ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Model Parameters ◽  
Fundamental Interaction ◽  
Acceleration Mechanism ◽  
Inverse Compton ◽  
Tev Gamma Rays

Gamma-ray bursts are capable of accelerating cosmic rays up to GZK energies Ep ~ 1020 eV, which can lead to a flux at Earth comparable to that observed by large EAS arrays such as Auger. The semi-relativistic outflows inferred in GRB-related hypernovae are also likely sources of somewhat lower energy cosmic rays. Leptonic processes, such as synchrotron and inverse Compton, as well as hadronic processes, can lead to GeV-TeV gamma-rays measurable by GLAST, AGILE, or ACTs, providing useful probes of the burst physics and model parameters. Photo-meson interactions also produce neutrinos at energies ranging from sub-TeV to EeV, which will be probed with forthcoming experiments such as IceCube, ANITA and KM3NeT. This would provide information about the fundamental interaction physics, the acceleration mechanism, the nature of the sources and their environment.

scholarly journals Follow the BAT: Monitoring Swift BAT FoV for Prompt Optical Emission from Gamma-ray Bursts

2011 ◽  
Author(s):  
T. N. Ukwatta ◽  
J. Linnemann ◽  
K. S. Dhuga ◽  
N. Gehrels ◽  
J. E. McEnery ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Optical Emission ◽  
Gamma Ray Bursts

scholarly journals Evidence of two spectral breaks in the prompt emission of gamma-ray bursts

2019 ◽  
Vol 625 ◽  
pp. A60 ◽  
Author(s):  
M. E. Ravasio ◽  
G. Ghirlanda ◽  
L. Nava ◽  
G. Ghisellini
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Low Energy ◽  
Emission Region ◽  
Peak Energy ◽  
Standard Scenario ◽  
Low Magnetic Field ◽  
Short Grbs ◽  
Prompt Emission ◽  
Good Agreement

The long-lasting tension between the observed spectra of gamma-ray bursts (GRBs) and the predicted synchrotron emission spectrum might be solved if electrons do not completely cool. Evidence of incomplete cooling was recently found in Swift GRBs with prompt observations down to 0.1 keV, and in one bright Fermi burst, GRB 160625B. Here we systematically search for evidence of incomplete cooling in the spectra of the ten brightest short and long GRBs observed by Fermi. We find that in eight out of ten long GRBs there is compelling evidence of a low-energy break (below the peak energy) and good agreement with the photon indices of the synchrotron spectrum (respectively −2/3 and −3/2 below the break and between the break and the peak energy). Interestingly, none of the ten short GRBs analysed shows a break, but the low-energy spectral slope is consistent with −2/3. In a standard scenario, these results imply a very low magnetic field in the emission region (B′∼10 G in the comoving frame), at odd with expectations.

scholarly journals GRB 090727 AND GAMMA-RAY BURSTS WITH EARLY-TIME OPTICAL EMISSION

2013 ◽  
Vol 772 (1) ◽  
pp. 73 ◽  
Author(s):  
D. Kopač ◽  
S. Kobayashi ◽  
A. Gomboc ◽  
J. Japelj ◽  
C. G. Mundell ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Early Time ◽  
Optical Emission ◽  
Gamma Ray Bursts

scholarly journals Master Robotic Net

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Vladimir Lipunov ◽  
Victor Kornilov ◽  
Evgeny Gorbovskoy ◽  
Nikolaj Shatskij ◽  
Dmitry Kuvshinov ◽  
...  
Keyword(s):  
Dark Energy ◽  
Solar System ◽  
Gamma Ray ◽  
Optical Emission ◽  
Gamma Ray Bursts ◽  
Sky Survey ◽  
Single Night

The main goal of the MASTER-Net project is to produce a unique fast sky survey with all sky observed over a single night down to a limiting magnitude of 19-20. Such a survey will make it possible to address a number of fundamental problems: search for dark energy via the discovery and photometry of supernovae (including SNIa), search for exoplanets, microlensing effects, discovery of minor bodies in the Solar System, and space-junk monitoring. All MASTER telescopes can be guided by alerts, and we plan to observe prompt optical emission from gamma-ray bursts synchronously in several filters and in several polarization planes.

scholarly journals Exceptionally bright optical emission from a rare and distant gamma-ray burst

2021 ◽  
Author(s):  
Gor Oganesyan ◽  
Sergey Karpov ◽  
Martin Jelinek ◽  
Gregory Beskin ◽  
Samuele Ronchini ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Massive Stars ◽  
Optical Emission ◽  
Gamma Ray Bursts ◽  
Additional Component ◽  
Relativistic Jets ◽  
X Ray ◽  
Forward Shock ◽  
Multi Wavelength ◽  
Wavelength Emission

Abstract Long gamma-ray bursts (GRBs) are produced by the dissipation of ultra-relativistic jets launched by newly-born black holes after the collapse of massive stars. Right after the luminous and highly variable gamma-ray emission, the multi-wavelength afterglow is released by the external dissipation of the jet in circumburst medium. We report the discovery of a very bright (10 mag) optical emission 28 s after the explosion of the extremely luminous and energetic GRB 210619B located at redshift 1.937. Early multi-filter observations allowed us to witness the end of the shock wave propagation into the GRB ejecta. We observed the spectral transition from a bright reverse to the forward shock emission, demonstrating that the early and late GRB multi-wavelength emission is originated from a very narrow jet propagating into an unusually rarefied interstellar medium. We also find evidence of an additional component of radiation, coming from the jet wings which is able explain the uncorrelated optical/X-ray emission.

scholarly journals External Inverse-Compton Emission from Low-luminosity Gamma-Ray Bursts: Application to GRB 190829A

2021 ◽  
Vol 920 (1) ◽  
pp. 55
Author(s):  
B. Theodore Zhang ◽  
Kohta Murase ◽  
Péter Veres ◽  
Péter Mészáros
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Inverse Compton
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