Prompt emission of particles in TDHF central collision

1983 ◽  
Vol 121 (5) ◽  
pp. 297-302 ◽  
Author(s):  
S. Drożdż ◽  
J. Okołowicz ◽  
M. Ploszajczak
Keyword(s):  
Central Collision ◽  
Prompt Emission

scholarly journals Interpreting the X-ray afterglows of gamma-ray bursts with radiative losses and millisecond magnetars

2020 ◽  
Vol 499 (4) ◽  
pp. 5986-5992
Author(s):  
Nikhil Sarin ◽  
Paul D Lasky ◽  
Gregory Ashton
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Dipole Radiation ◽  
X Ray ◽  
Radiative Efficiency ◽  
Central Engine ◽  
Radiative Losses ◽  
Wave Emission ◽  
Prompt Emission

ABSTRACT The spin-down energy of millisecond magnetars has been invoked to explain X-ray afterglow observations of a significant fraction of short and long gamma-ray bursts. Here, we extend models previously introduced in the literature, incorporating radiative losses with the spin-down of a magnetar central engine through an arbitrary braking index. Combining this with a model for the tail of the prompt emission, we show that our model can better explain the data than millisecond-magnetar models without radiative losses or those that invoke spin-down solely through vacuum dipole radiation. We find that our model predicts a subset of X-ray flares seen in some gamma-ray bursts. We can further explain the diversity of X-ray plateaus by altering the radiative efficiency and measure the braking index of newly born millisecond magnetars. We measure the braking index of GRB061121 as $n=4.85^{+0.11}_{-0.15}$ suggesting the millisecond-magnetar born in this gamma-ray burst spins down predominantly through gravitational-wave emission.

scholarly journals Optical Afterglows as Probes for the Central Engine and Fireball of Gamma-Ray Bursts

2012 ◽  
Vol 8 (S290) ◽  
pp. 263-264
Author(s):  
Liang Li ◽  
En-Wei Liang ◽  
He Gao ◽  
Bing Zhang
Keyword(s):  
Statistical Analysis ◽  
Gamma Rays ◽  
Density Profile ◽  
Gamma Ray ◽  
Ambient Medium ◽  
Gamma Ray Bursts ◽  
Prompt Gamma ◽  
Medium Density ◽  
Central Engine ◽  
Prompt Emission

AbstractWell-sampled optical lightcurves of 146 gamma-ray bursts (GRBs) are compiled from literature. We identify possible emission components based on our empirical fits and present statistical analysis for these components. We find that the flares are related to prompt emission, suggesting that they could have the same origin in different episodes. The shallow decay segment is not correlated with prompt gamma-rays. It likely signals a long-lasting injected wind from GRB central engines. Early after onset peak is closely related with prompt emission. The ambient medium density profile is likely n ∝ r−1. No correlation between the late re-brightening bump and prompt gamma-rays or the onset bump is found. They may be from another jet component.

The Prompt Emission of GRB 990712 with [ITAL]B[/ITAL][CSC][ITAL]eppo[/ITAL][/CSC][ITAL]SAX[/ITAL]: Evidence of a Transient X-Ray Emission Feature

2001 ◽  
Vol 550 (1) ◽  
pp. L47-L51 ◽  
Author(s):  
F. Frontera ◽  
L. Amati ◽  
M. Vietri ◽  
J. J. M. in ’t Zand ◽  
E. Costa ◽  
...  
Keyword(s):  
Emission Feature ◽  
X Ray ◽  
Prompt Emission

scholarly journals GRB 060714: No Clear Dividing Line between Prompt Emission and X‐Ray Flares

2007 ◽  
Vol 665 (1) ◽  
pp. 554-568 ◽  
Author(s):  
H. A. Krimm ◽  
J. Granot ◽  
F. E. Marshall ◽  
M. Perri ◽  
S. D. Barthelmy ◽  
...  
Keyword(s):  
X Ray ◽  
Prompt Emission ◽  
Dividing Line

scholarly journals A Decreasing Column Density during the Prompt Emission from GRB 000528 Observed withBeppoSAX

2004 ◽  
Vol 614 (1) ◽  
pp. 301-308 ◽  
Author(s):  
F. Frontera ◽  
L. Amati ◽  
D. Lazzati ◽  
E. Montanari ◽  
M. Orlandini ◽  
...  
Keyword(s):  
Column Density ◽  
Prompt Emission

scholarly journals Prompt emission from the counter jet of a short gamma-ray burst

2018 ◽  
Vol 2018 (3) ◽  
Author(s):  
Ryo Yamazaki ◽  
Kunihito Ioka ◽  
Takashi Nakamura
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Prompt Emission

scholarly journals GRB 070311: a direct link between the prompt emission and the afterglow

2007 ◽  
Vol 474 (3) ◽  
pp. 793-805 ◽  
Author(s):  
C. Guidorzi ◽  
S. D. Vergani ◽  
S. Sazonov ◽  
S. Covino ◽  
D. Malesani ◽  
...  
Keyword(s):  
Direct Link ◽  
Prompt Emission

scholarly journals Explaining GRB prompt emission with sub-photospheric dissipation and Comptonization

2019 ◽  
Author(s):  
Mukul Bhattacharya ◽  
Pawan Kumar
Keyword(s):  
Energy Content ◽  
Lorentz Factor ◽  
Photon Spectrum ◽  
Emission Model ◽  
Electron Number ◽  
Radiation Mechanism ◽  
Radiative Efficiency ◽  
Number Ratio ◽  
Sufficient Energy ◽  
Prompt Emission

Abstract Even though the observed spectra for GRB prompt emission is well constrained, no single radiation mechanism can robustly explain its distinct non-thermal nature. Here we explore the radiation mechanism with the photospheric emission model using our Monte Carlo Radiative Transfer (MCRaT) code. We study the sub-photospheric Comptonization of fast cooled synchrotron photons while the Maxwellian electrons and mono-energetic protons are accelerated to relativistic energies by repeated dissipation events. Unlike previous simulations, we implement a realistic photon to electron number ratio Nγ/Ne ∼ 105 consistent with the observed radiative efficiency of a few percent. We show that it is necessary to have a critical number of episodic energy injection events Nrh, cr ∼ few 10s − 100 in the jet in addition to the electron-proton Coulomb coupling in order to inject sufficient energy Einj, cr ∼ 2500 − 4000 mec2 per electron and produce an output photon spectrum consistent with observations. The observed GRB spectrum can be generated when the electrons are repeatedly accelerated to highly relativistic energies γe, in ∼ few 10s − 100 in a jet with bulk Lorentz factor Γ ∼ 30 − 100, starting out from moderate optical depths τin ∼ 20 − 40. The shape of the photon spectrum is independent of the initial photon energy distribution and baryonic energy content of the jet and hence independent of the emission mechanism, as expected for photospheric emission.

scholarly journals The properties of prompt emission in short gamma-ray bursts with extended emission observed by Fermi/GBM

2020 ◽  
Vol 492 (3) ◽  
pp. 3622-3630
Author(s):  
Lin Lan ◽  
Rui-Jingi Lu ◽  
Hou-Jun Lü ◽  
Jun Shen ◽  
Jared Rice ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Large Scatter ◽  
Intrinsic Properties ◽  
Temporal Properties ◽  
Peak Energy ◽  
Peak Flux ◽  
Short Grbs ◽  
Prompt Emission ◽  
Extended Emission

ABSTRACT Short gamma-ray bursts (GRB) with extended emission (EE) that are composed of an initial short hard spike followed by a long-lasting EE are thought to comprise a sucategory of short GRBs. The narrow energy band available during the Swift era, combined with a lack of spectral information, prevented the discovery of the intrinsic properties of these events. In this paper, we perform a systematic search of short GRBs with EE using all available Fermi/GBM data. The search identified 26 GBM-detected short GRBs with EE that are similar to GRB 060614 observed by Swift/BAT. We focus on investigating the spectral and temporal properties of both the hard spike and the EE component of all 26 GRBs, and explore differences and possible correlations between them. We find that while the peak energy (Ep) of the hard spikes is slightly harder than that of the EE, their fluences are comparable. The harder Ep seems to correspond to a larger fluence and peak flux, with a large scatter for both the hard spike and the EE component. Moreover, the Ep of both the hard spike and the EE are compared with other short GRBs. Finally, we also compare the properties of GRB 170817A with those of short GRBs with EE and find no significant statistical differences between them. We find that GRB 170817A has the lowest Ep, probably because it is off-axis.

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