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 On-axis view of GRB 170817A

2019 ◽  
Vol 628 ◽  
pp. A18 ◽  
Author(s):  
O. S. Salafia ◽  
G. Ghirlanda ◽  
S. Ascenzi ◽  
G. Ghisellini
Keyword(s):  
Gamma Ray ◽  
Surrounding Medium ◽  
Intrinsic Properties ◽  
Wave Event ◽  
Typical Event ◽  
Multi Wavelength ◽  
Star Binary ◽  
Jet Structure ◽  
Prompt Emission ◽  
Axis View

The peculiar short gamma-ray burst (SGRB) GRB 170817A has been firmly associated to the gravitational wave event GW170817, which has been unanimously interpreted as due to the coalescence of a double neutron star binary. The unprecedented behaviour of the non-thermal afterglow led to a debate over its nature, which was eventually settled by high-resolution VLBI observations that strongly support the off-axis structured jet scenario. Using information on the jet structure derived from multi-wavelength fitting of the afterglow emission and of the apparent VLBI image centroid motion, we compute the appearance of a GRB 170817A-like jet as seen by an on-axis observer and compare it to the previously observed population of SGRB afterglows and prompt emission events. We find that the intrinsic properties of the GRB 170817A jet are representative of a typical event in the SGRB population, hinting at a quasi-universal jet structure. The diversity in the SGRB afterglow population could therefore be ascribed in large part to extrinsic (redshift, density of the surrounding medium, viewing angle) rather than intrinsic properties. Although more uncertain, the comparison can be extended to the prompt emission properties, leading to similar conclusions.

scholarly journals SHORT GAMMA-RAY BURST FORMATION RATE FROM BATSE DATA USINGEp-LpCORRELATION AND THE MINIMUM GRAVITATIONAL-WAVE EVENT RATE OF A COALESCING COMPACT BINARY

2014 ◽  
Vol 789 (1) ◽  
pp. 65 ◽  
Author(s):  
Daisuke Yonetoku ◽  
Takashi Nakamura ◽  
Tatsuya Sawano ◽  
Keitaro Takahashi ◽  
Asuka Toyanago
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
Event Rate ◽  
Formation Rate ◽  
Gamma Ray Burst ◽  
Compact Binary ◽  
Wave Event

scholarly journals High-energy neutrinos from the gravitational wave event GW150914 possibly associated with a short gamma-ray burst

2016 ◽  
Vol 93 (12) ◽  
Author(s):  
Reetanjali Moharana ◽  
Soebur Razzaque ◽  
Nayantara Gupta ◽  
Peter Mészáros
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Burst ◽  
Wave Event ◽  
High Energy Neutrinos

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 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 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 Testing merging of dark exotic stars from gravitational waves in the multi-messenger approach

2018 ◽  
Vol 33 (29) ◽  
pp. 1850167 ◽  
Author(s):  
Andrea Addazi ◽  
Antonino Marciano
Keyword(s):  
Dark Matter ◽  
Neutron Stars ◽  
Gamma Ray ◽  
New Physics ◽  
Dark Matter Halo ◽  
Electromagnetic Signal ◽  
Gamma Ray Burst ◽  
Ordinary Matter ◽  
Spatially Correlated ◽  
Wave Event

We discuss possible implications of the recent detection by the LIGO and VIRGO collaboration of the gravitational-wave event GW170817, the signal of which is consistent with predictions in general relativity on the merging of neutron stars. A near-simultaneous and spatially correlated observation of a gamma-ray burst, the GRB 170817A signal, was achieved independently by the Fermi Gamma-ray Burst Monitor, and by the Anti-coincidence Shield for the Spectrometer of the International Gamma-Ray Astrophysics Laboratory. Motivated by this near temporal and spatial concomitance of events, which can occur by chance only with the probability [Formula: see text], we speculate on the possibility that new dark stars signals could be detected from the LIGO/VIRGO detectors. This proposal, which aims at providing a test for some models of dark matter, relies on the recent achievement of detecting, for visible ordinary matter, the merging of neutron stars both in the gravitational and the electromagnetic channel. A lack of correlation between the two expected signals would suggest a deviation from the properties of ordinary matter. Specifically, we focus on models of invisible dark matter, and in particular we study the case of mirror dark matter, within the framework of which a large amount of mirror neutron stars are naturally envisaged to occupy our dark matter halo. The observation of an electromagnetically hidden event inside the dark matter halo of our galaxy should provide a hint of new physics. There would be indeed no satisfactorily complete explanation accounting for the lack of electromagnetic signal, if only standard neutron star merging were considered to describe events that happen so close to us.

scholarly journals Ready, Set, Launch: Time Interval between a Binary Neutron Star Merger and Short Gamma-Ray Burst Jet Formation

2020 ◽  
Vol 895 (2) ◽  
pp. L33 ◽  
Author(s):  
Paz Beniamini ◽  
Rodolfo Barniol Duran ◽  
Maria Petropoulou ◽  
Dimitrios Giannios
Keyword(s):  
Neutron Star ◽  
Gamma Ray ◽  
Time Interval ◽  
Jet Formation ◽  
Gamma Ray Burst ◽  
Binary Neutron Star
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