Exploring Short-GRB afterglow parameter space for observations in coincidence with gravitational waves

Abstract

Short duration Gamma Ray Bursts(SGRB) and their afterglows are among the most promising electro-magnetic (EM) counterparts of Neutron Star (NS) mergers. The afterglow emission is broadband, visible across the entire electro-magnetic window from $\gamma$-ray to radio frequencies. The flux evolution in these frequencies is sensitive to the multi-dimensional afterglow physical parameter space. Observations of gravitational wave (GW) from BNS mergers in spatial and temporal coincidence with SGRB and associated afterglows can provide valuable constraints on afterglow physics. We run simulations of GW-detected BNS events and assuming all of them are associated with a GRB jet which also produces an afterglow, investigate how detections or non-detections in X-ray, optical and radio frequencies can be influenced by the parameter space. We narrow-down the regions of afterglow parameter space for a uniform top-hat jet model which would result in different detection scenarios. We list inferences which can be drawn on the physics of GRB afterglows from multi-messenger astronomy with coincident GW-EM observations.

Published in MNRAS

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Cited by in corpus (9)

• Radio afterglows of binary neutron star mergers: a population study for current and future gravitational wave observing runs
• jetsimpy: A Highly Efficient Hydrodynamic Code for Gamma-ray Burst Afterglow
• Prospects of joint detections of neutron star mergers and short-GRBs with Gaussian structured jets
• Rates of Short-GRB afterglows in association with Binary Neutron Star mergers
• On the energetics of a possible relativistic jet associated with the binary neutron star merger candidate S190425z
• Detectability of Electromagnetic counterparts from Neutron Star mergers: prompt emission vs afterglow
• Perspectives for multi-messenger astronomy with the next generation of gravitational-wave detectors and high-energy satellites
• Kilonova rates from spherical and axisymmetrical models
• Host galaxies and electromagnetic counterparts to binary neutron star mergers across the cosmic time: Detectability of GW170817-like events