scholarly journals Testing Gamma‐Ray Burst Jet Structure with the Distribution of Gamma‐Ray Energy Release

2005 ◽  
Vol 634 (2) ◽  
pp. 1155-1165 ◽  
Author(s):  
L. Xu ◽  
X. F. Wu ◽  
Z. G. Dai
Keyword(s):  
Energy Release ◽  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Jet Structure

scholarly journals Luminosity function and jet structure of Gamma-Ray Burst

2015 ◽  
Vol 447 (2) ◽  
pp. 1911-1921 ◽  
Author(s):  
A. Pescalli ◽  
G. Ghirlanda ◽  
O. S. Salafia ◽  
G. Ghisellini ◽  
F. Nappo ◽  
...  
Keyword(s):  
Luminosity Function ◽  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Jet Structure

scholarly journals Inverse reconstruction of jet structure from off-axis gamma-ray burst afterglows

2020 ◽  
Vol 497 (1) ◽  
pp. 1217-1235
Author(s):  
Kazuya Takahashi ◽  
Kunihito Ioka
Keyword(s):  
Gamma Ray ◽  
Standard Theory ◽  
Inversion Method ◽  
Jet Formation ◽  
Gamma Ray Burst ◽  
Inverse Reconstruction ◽  
Wave Event ◽  
Novel Method ◽  
Jet Structure ◽  
High Cadence

ABSTRACT The gravitational wave event GW 170817 and the slowly rising afterglows of short gamma-ray burst (GRB) 170817A clearly suggest that the GRB jet has an angular structure. However the actual jet structure remains unclear as different authors give different structures. We formulate a novel method to inversely reconstruct the jet structure from off-axis GRB afterglows, without assuming any functional form of the structure in contrast to the previous studies. The jet structure is uniquely determined from the rising part of a light curve for a given parameter set by integrating an ordinary differential equation, which is derived from the standard theory of GRB afterglows. Applying to GRB 170817A, we discover that a non-trivial hollow-cone jet is consistent with the observed afterglows, as well as Gaussian and power-law jets within errors, which implies the Blandford–Znajek mechanism or ejecta–jet interaction. The current observations only constrain the jet core, not in principle the outer jet structure around the line of sight. More precise and high-cadence observations with our inversion method will fix the jet structure, providing a clue to the jet formation and propagation.

scholarly journals Comparing Short Gamma-Ray Burst Jet Structure Models

2020 ◽  
Vol 891 (2) ◽  
pp. 124 ◽  
Author(s):  
Fergus Hayes ◽  
Ik Siong Heng ◽  
John Veitch ◽  
Daniel Williams
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Jet Structure

scholarly journals What determines the structure of short gamma-ray burst jets?

2021 ◽  
Author(s):  
Gerardo Urrutia ◽  
Fabio De Colle ◽  
Ariadna Murguia-Berthier ◽  
Enrico Ramirez-Ruiz
Keyword(s):  
Neutron Star ◽  
Gamma Ray ◽  
Initial Structure ◽  
Gamma Ray Burst ◽  
Final Structure ◽  
Central Engine ◽  
Wide Range ◽  
Reasonable Description ◽  
Jet Structure ◽  
Short Grbs

Abstract The discovery of GRB 170817A, the first unambiguous off-axis short gamma-ray burst arising from a neutron star merger, has challenged our understanding of the angular structure of relativistic jets. Studies of the jet propagation usually assume that the jet is ejected from the central engine with a top-hat structure and its final structure, which determines the observed light curve and spectra, is primarily regulated by the interaction with the nearby environment. However, jets are expected to be produced with a structure that is more complex than a simple top-hat, as shown by global accretion simulations. We present numerical simulations of short GRBs launched with a wide range of initial structures, durations and luminosities. We follow the jet interaction with the merger remnant wind and compute its final structure at distances ≳ 1011 cm from the central engine. We show that the final jet structure, as well as the resulting afterglow emission, depend strongly on the initial structure of the jet, its luminosity and duration. While the initial structure at the jet is preserved for long-lasting SGRBs, it is strongly modified for jets barely making their way through the wind. This illustrates the importance of combining the results of global simulations with propagation studies in order to better predict the expected afterglow signatures from neutron star mergers. Structured jets provide a reasonable description of the GRB 170817A afterglow emission with an off-axis angle θobs ≈ 22.5○.

scholarly journals Magnetohydrodynamic simulations of gamma-ray burst jets: Beyond the progenitor star

New Astronomy ◽  
2010 ◽  
Vol 15 (8) ◽  
pp. 749-754 ◽  
Author(s):  
Alexander Tchekhovskoy ◽  
Ramesh Narayan ◽  
Jonathan C. McKinney
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Magnetohydrodynamic Simulations
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