scholarly journals GRB PROMPT EMISSION AND THE PHYSICS OF ULTRA-RELATIVISTIC OUTFLOWS

2020 ◽  
pp. 185-192
Author(s):  
F. Daigne
Keyword(s):  
Relativistic Outflows ◽  
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
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