LOFAR 144-MHz follow-up observations of GW170817

Abstract

We present low-radio-frequency follow-up observations of AT 2017gfo, the electromagnetic counterpart of GW170817, which was the first binary neutron star merger to be detected by Advanced LIGO-Virgo. These data, with a central frequency of 144 MHz, were obtained with LOFAR, the Low-Frequency Array. The maximum elevation of the target is just 13.7 degrees when observed with LOFAR, making our observations particularly challenging to calibrate and significantly limiting the achievable sensitivity. On time-scales of 130-138 and 371-374 days after the merger event, we obtain 3$\sigma$ upper limits for the afterglow component of 6.6 and 19.5 mJy beam${}^{-1}$, respectively. Using our best upper limit and previously published, contemporaneous higher-frequency radio data, we place a limit on any potential steepening of the radio spectrum between 610 and 144 MHz: the two-point spectral index ${\alpha }_{144}^{610}\gtrsim -2.5$. We also show that LOFAR can detect the afterglows of future binary neutron star merger events occurring at more favourable elevations.

arXiv comment9 pages, 2 figures, accepted for publication in MNRAS

References in corpus (67)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Multi-messenger Observations of a Binary Neutron Star Merger
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• Advanced LIGO
• LOFAR: The LOw-Frequency ARray
• The VizieR database of Astronomical Catalogues
• An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi-GBM Detection of GRB 170817A
• The Murchison Widefield Array: the Square Kilometre Array Precursor at low radio frequencies
• The X-ray counterpart to the gravitational wave event GW 170817
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• Illuminating Gravitational Waves: A Concordant Picture of Photons from a Neutron Star Merger
• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• Superluminal motion of a relativistic jet in the neutron star merger GW170817
• The LOFAR Two-metre Sky Survey - II. First data release
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue
• 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
• Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts and Nucleosynthesis
• Compact radio emission indicates a structured jet was produced by a binary neutron star merger
• Radio Remnants of Compact Binary Mergers - the Electromagnetic Signal that will follow the Gravitational Waves
• A morphological algorithm for improving radio-frequency interference detection
• A mildly relativistic wide-angle outflow in the neutron star merger GW170817
• The Australia Telescope Compact Array Broadband Backend (CABB)
• 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
• Post-correlation radio frequency interference classification methods
• A broadband flux scale for low frequency radio telescopes
• LOFAR facet calibration
• The outflow structure of GW170817 from late time broadband observations
• LOFAR 150-MHz observations of the Boötes field: Catalogue and Source Counts
• Faceting for direction-dependent spectral deconvolution
• Identifying Elusive Electromagnetic Counterparts to Gravitational Wave Mergers: an end-to-end simulation
• Follow up of GW170817 and its electromagnetic counterpart by Australian-led observing programs
• Systematic effects in LOFAR data: A unified calibration strategy
• A magnetar origin for the kilonova ejecta in GW170817
• Radio interferometric gain calibration as a complex optimization problem
• A Decline in the X-ray through Radio Emission from GW170817 Continues to Support an Off-Axis Structured Jet
• The Distance to NGC 4993: The Host Galaxy of the Gravitational-wave Event GW170817
• A year in the life of GW170817: the rise and fall of a structured jet from a binary neutron star merger
• 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
• A long-lived neutron star merger remnant in GW170817: constraints and clues from X-ray observations
• Two years of non-thermal emission from the binary neutron star merger GW170817: rapid fading of the jet afterglow and first constraints on the kilonova fastest ejecta
• The LWA1 Radio Telescope
• Non-linear Kalman filters for calibration in radio interferometry
• When Did the Remnant of GW170817 Collapse to a Black Hole?
• Low frequency view of GW 170817/GRB 170817A with the Giant Meterwave Radio Telescope
• Long-lived Remnants from Binary Neutron Star Mergers
• A long-lived remnant neutron star after GW170817 inferred from its associated kilonova
• The allowed parameter space of a long-lived neutron star as the merger remnant of GW170817
• Radio Counterparts of Compact Binary Mergers detectable in Gravitational Waves: A Simulation for an Optimized Survey
• Capturing the electromagnetic counterparts of binary neutron star mergers through low latency gravitational wave triggers
• Post-correlation filtering techniques for off-axis source and RFI removal
• A Deep Search for Prompt Radio Emission from the Short GRB 150424A With The Murchison Widefield Array
• An upper-limit on the linear polarization fraction of the GW170817 radio continuum
• LOFAR observations of the XMM-LSS field
• Constraining coherent low frequency radio flares from compact binary mergers
• Limits on GRB Prompt Radio Emission Using the LWA1
• Applying Wirtinger derivatives to the radio interferometry calibration problem
• A simultaneous search for prompt radio emission associated with the short GRB 170112A using the all-sky imaging capability of the OVRO-LWA
• Using negative-latency gravitational wave alerts to detect prompt radio bursts from binary neutron star mergers with the Murchison Widefield Array
• A First Search for Prompt Radio Emission from a Gravitational-Wave Event
• Strategies for Finding Prompt Radio Counterparts to Gravitational Wave Transients with the Murchison Widefield Array
• LOFAR early-time search for coherent radio emission from GRB 180706A
• Multi-messenger astronomy of gravitational-wave sources with flexible wide-area radio transient surveys

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• Limits on long-time-scale radio transients at 150 MHz using the TGSS ADR1 and LoTSS DR2 catalogues
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• LOFAR observations of gravitational wave merger events: O3 results and O4 strategy
• RADAR-Radio Afterglow Detection and AI-driven Response: A Federated Framework for Gravitational Wave Event Follow-Up