The Detection Prospect of the Counter Jet Radiation in the Late Afterglow of GRB 170817A

Abstract

The central engine of a Gamma-Ray Burst (GRB) is widely believed to launch a pair of oppositely moving jets, i.e. the forward jet moving towards us and the counter jet regressing away. The forward jet generates the radiation typically observed in GRBs, while the counter jet has not been detected yet due to its dimness. GRB 170817A, a short burst associated with a binary neutron star merger event, is a nearby event ($z=0.0097$) with an off-axis structured energetic forward jet and hence probably the most suitable target for searching the counter jet radiation. Assuming the same properties for the forward and counter jet components as well as the shock parameters, the fit to the multi-wavelength afterglow emission of GRB 170817A suggests a peak time $\sim \mathrm{quite}\mathrm{a}\mathrm{few}\times 10^3$ day of the counter jet radiation, but the detection prospect of this new component is not promising. Anyhow, if the shock parameters (${\epsilon }_{\mathrm{e}}$ and ${\epsilon }_{\mathrm{B}}$) of the counter jet component are (a few times) higher than that of the forward shock e.g., the posterior results of the magnetic energy fraction of the forward shock and the counter jet are ${\log }_{10}{\epsilon }_{\mathrm{B}}=-4.23_{-0.69}^{+1.42}$ and ${\log }_{10}{\epsilon }_{\mathrm{B},\mathrm{cj}}=-3.65_{-2.11}^{+3.06}$, respectively), as still allowed by the current data, the counter jet afterglow emission will be enhanced and hence may be detected. A few hour exposure by JWST in F356W band will stringently test such a scenario.

References in corpus (72)

• Multi-messenger Observations of a Binary Neutron Star Merger
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• The James Webb Space Telescope
• An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi-GBM Detection of GRB 170817A
• Optical and Long Wavelength Afterglow from Gamma-Ray Bursts
• Bilby: A user-friendly Bayesian inference library for gravitational-wave astronomy
• Short-Duration Gamma-Ray Bursts
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. II. UV, Optical, and Near-IR Light Curves and Comparison to Kilonova Models
• Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
• A kilonova as the electromagnetic counterpart to a gravitational-wave source
• The X-ray counterpart to the gravitational wave event GW 170817
• Illuminating Gravitational Waves: A Concordant Picture of Photons from a Neutron Star Merger
• Hyper-Accreting Black Holes and Gamma-Ray Bursts
• Superluminal motion of a relativistic jet in the neutron star merger GW170817
• Swift and NuSTAR observations of GW170817: detection of a blue kilonova
• A Radio Counterpart to a Neutron Star Merger
• A Decade of Short-duration Gamma-ray Burst Broad-band Afterglows: Energetics, Circumburst Densities, and Jet Opening Angles
• The Expanded Very Large Array -- a New Telescope for New Science
• Relativistic Jets in Collapsars
• Afterglow lightcurves, viewing angle and the jet structure of gamma-ray bursts
• Compact radio emission indicates a structured jet was produced by a binary neutron star merger
• The Binary Neutron Star event LIGO/VIRGO GW170817 a hundred and sixty days after merger: synchrotron emission across the electromagnetic spectrum
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. VI. Radio Constraints on a Relativistic Jet and Predictions for Late-Time Emission from the Kilonova Ejecta
• Gamma-ray burst beaming: a universal configuration with a standard energy reservoir?
• The outflow structure of GW170817 from late time broadband observations
• The Propagation and Eruption of Relativistic Jets from the Stellar Progenitors of GRBs
• The Blandford-Znajek Process as a Centeral Engine for a Gamma Ray Burst
• AT2017gfo: an anisotropic and three-component kilonova counterpart of GW170817
• Gamma-Ray Burst Afterglows In The Multi-Messenger Era: Numerical Models and Closure Relations
• Relativistic outflows from remnants of compact object mergers and their viability for short gamma-ray bursts
• A Deep Chandra X-ray Study of Neutron Star Coalescence GW170817
• A Decline in the X-ray through Radio Emission from GW170817 Continues to Support an Off-Axis Structured Jet
• The evolution of the X-ray afterglow emission of GW 170817 / GRB 170817A in XMM-Newton observations
• The Dynamics and Afterglow Radiation of Gamma-Ray Bursts. I. Constant Density Medium
• Off-Axis Gamma-Ray Burst Afterglow Modeling Based On A Two-Dimensional Axisymmetric Hydrodynamics Simulation
• Electromagnetic Counterparts to Structured Jets from Gravitational Wave Detected Mergers
• A year in the life of GW170817: the rise and fall of a structured jet from a binary neutron star merger
• The polarisation of afterglow emission reveals GRB jet structure
• A turnover in the radio light curve of GW170817
• The optical afterglow of GW170817 at one year post-merger
• A Strong Jet Signature in the Late-Time Lightcurve of GW170817
• Universal GRB jets from jet-cocoon interaction in massive stars
• Off-axis short GRBs from structured jets as counterparts to GW events
• Nested Sampling with Normalising Flows for Gravitational-Wave Inference
• Afterglow Imaging and Polarization of Misaligned Structured GRB Jets and Cocoons: Breaking the Degeneracy in GRB 170817A
• Low frequency view of GW 170817/GRB 170817A with the Giant Meterwave Radio Telescope
• The origin and propagation of variability in the outflows of long duration gamma-ray bursts
• Evidence for Cocoon Emission from the Early Light Curve of SSS17a
• Short GRBs: opening angles, local neutron star merger rate and off-axis events for GRB/GW association
• GRB 170817A as a jet counterpart to gravitational wave trigger GW 170817
• Radioactive heating rate of r-process elements and macronova light curve
• Theory and astrophysical consequences of a magnetized torus around a rapidly rotating black hole
• Luminosity function and jet structure of Gamma Ray Bursts
• Late-time Evolution of Afterglows from Off-Axis Neutron-Star Mergers
• The on-axis view of GRB 170817A
• Joint gravitational wave -- gamma-ray burst detection rates in the aftermath of GW170817
• Baryon Loading of Gamma Ray Bursts by Pick-up Neutrons
• Neutron-Rich Hydromagnetic Outflows in Gamma-Ray Burst Sources
• Radio Imaging of GRB Jets in Nearby Supernovae
• A two component jet model for the X-ray afterglow flat segment in short GRB 051221A
• Testing the Predictions of the Universal Structured GRB Jet Model
• Multimessenger parameter estimation of GW170817: from jet structure to the Hubble constant
• GW170817 4.5 years after merger: Dynamical ejecta afterglow constraints
• The late afterglow of GW170817/GRB170817A: a large viewing angle and the shift of the Hubble constant to a value more consistent with the local measurements
• Interpreting GRB170817A as a giant flare from a jet-less double neutron-star merger
• jetsimpy: A Highly Efficient Hydrodynamic Code for Gamma-ray Burst Afterglow
• Late-Time Radio Re-Brightening of Gamma-Ray Burst Afterglows: Evidence for Double-Sided Jets
• Late-Time Afterglow from Double-Sided Structured Jets: Application to GRB 170817A
• On the afterglow from the receding jet of gamma-ray burst
• Prompt emission from the counter jet of a short gamma-ray burst
• Late afterglow emission statistics: a clear link between GW170817 and bright short GRBs