An optimised gravitational wave follow-up strategy with the Australian Square Kilometre Array Pathfinder

Abstract

The detection of a neutron star merger by the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) and Advanced Virgo gravitational wave detectors and the subsequent detection of an electromagnetic counterpart has opened a new era of transient astronomy. With upgrades to the Advanced LIGO and Advanced Virgo detectors and new detectors coming online in Japan and India, neutron star mergers will be detected at a higher rate in the future, starting with the O3 observing run which will begin in early 2019. The detection of electromagnetic emission from these mergers provides vital information about merger parameters and allows independent measurement of the Hubble constant. The Australian Square Kilometre Array Pathfinder (ASKAP) is expected to become fully operational early 2019 and its 30 deg${}^2$ field of view will enable us to rapidly survey large areas of sky. In this work we explore prospects for detecting both prompt and long-term radio emission from neutron star mergers with ASKAP and determine an observing strategy that optimises the use of telescope time. We investigate different strategies to tile the sky with telescope pointings in order to detect radio counterparts with limited observing time, using 475 simulated gravitational wave events. Our results show a significant improvement in observing efficiency when compared with a naïve strategy of covering the entire localisation above some confidence threshold, even when achieving the same total probability covered.

References in corpus (21)

• The NumPy array: a structure for efficient numerical computation
• Multi-messenger Observations of a Binary Neutron Star Merger
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• A bright millisecond radio burst of extragalactic origin
• An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi-GBM Detection of GRB 170817A
• GW170608: Observation of a 19-solar-mass Binary Black Hole Coalescence
• Exploring the Sensitivity of Next Generation Gravitational Wave Detectors
• Swope Supernova Survey 2017a (SSS17a), the Optical Counterpart to a Gravitational Wave Source
• The X-ray counterpart to the gravitational wave event GW 170817
• Swift and NuSTAR observations of GW170817: detection of a blue kilonova
• A Radio Counterpart to a Neutron Star Merger
• A Deep Chandra X-ray Study of Neutron Star Coalescence GW170817
• Follow up of GW170817 and its electromagnetic counterpart by Australian-led observing programs
• The First Two Years of Electromagnetic Follow-Up with Advanced LIGO and Virgo
• Host Galaxies Catalog Used in LIGO Searches for Compact Binary Coalescence Events
• The detection of an extremely bright fast radio burst in a phased array feed survey
• Mass ejection from neutron star mergers: different components and expected radio signals
• Optical Follow-up of Gravitational-wave Events with Las Cumbres Observatory
• Radio precursors to neutron star binary mergings
• Cherenkov Telescope Array is Well Suited to Follow Up Gravitational Wave Transients
• Hunting electromagnetic counterparts of gravitational-wave events using the Zwicky Transient Facility

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• Detectability of neutron star merger afterglows
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• Web application for galaxy-targeted follow-up of electromagnetic counterparts to gravitational wave sources
• Searching for Gravitational-Wave Counterparts using the Transiting Exoplanet Survey Satellite
• History of Astronomy in Australia: Big-Impact Astronomy from World War II until the Lunar Landing (1945-1969)
• State Space Modelling for detecting and characterising Gravitational Waves afterglows