Inclination estimates from off-axis GRB afterglow modelling
arXiv:2109.00424 · doi:10.20944/preprints202108.0033.v1
Abstract
For gravitational wave (GW) detected neutron star mergers, one of the leading candidates for electromagnetic (EM) counterparts is the afterglow from an ultra-relativistic jet. Where this afterglow is observed, it will likely be viewed off-axis, such as the afterglow following GW170817/GRB 170817A. The temporal behaviour of an off-axis observed GRB afterglow can be used to reveal the lateral jet structure, and statistical model fits can put constraints on the various model free-parameters. Amongst these parameters is the inclination of the system to the line of sight. Along with the GW detection, the afterglow modelling provides the best constraint on the inclination to the line-of-sight and can improve the estimates of cosmological parameters e.g. the Hubble constant, from GW-EM events. However, modelling of the afterglow depends on the assumed jet structure and, often overlooked, the effects of lateral spreading. Here we show how the inclusion of lateral spreading in the afterglow models can affect the estimated inclination of GW-EM events.
arXiv comment14 pages, 5 figures, Accepted to the special issue of Universe, "Waiting for GODOT -- Present and Future of Multi-Messenger Astronomy"
References in corpus (21)
- The Shape of Spectral Breaks in GRB Afterglows
- Superluminal motion of a relativistic jet in the neutron star merger GW170817
- Compact radio emission indicates a structured jet was produced by a binary neutron star merger
- Late time afterglow observations reveal a collimated relativistic jet in the ejecta of the binary neutron star merger GW170817
- The Binary Neutron Star event LIGO/VIRGO GW170817 a hundred and sixty days after merger: synchrotron emission across the electromagnetic spectrum
- Overall Evolution of Jetted Gamma-ray Burst Ejecta
- The outflow structure of GW170817 from late time broadband observations
- Gamma-Ray Burst Afterglows In The Multi-Messenger Era: Numerical Models and Closure Relations
- Off-axis emission of short gamma-ray bursts and the detectability of electromagnetic counterparts of gravitational wave detected binary mergers
- Electromagnetic Counterparts to Structured Jets from Gravitational Wave Detected Mergers
- Gamma-ray burst afterglow broadband fitting based directly on hydrodynamics simulations
- Off-axis short GRBs from structured jets as counterparts to GW events
- Low frequency view of GW 170817/GRB 170817A with the Giant Meterwave Radio Telescope
- GRB 170817A as a jet counterpart to gravitational wave trigger GW 170817
- On the lateral expansion of GRB jets
- Late-time Evolution of Afterglows from Off-Axis Neutron-Star Mergers
- Afterglow constraints on the viewing angle of binary neutron star mergers and determination of the Hubble constant
- Continued radio observations of GW170817 3.5 years post-merger
- GRB jet structure and the jet break
- Multimessenger parameter estimation of GW170817: from jet structure to the Hubble constant
- Reverse Shocks in the Relativistic Outflows of Gravitational Wave Detected Neutron Star Binary Mergers