Low frequency view of GW 170817/GRB 170817A with the Giant Meterwave Radio Telescope

Abstract

The short gamma-ray burst (GRB) 170817A was the first GRB associated with a gravitational-wave event. Due to the exceptionally low luminosity of the prompt $\gamma$-ray and the afterglow emission, the origin of both radiation components is highly debated. The most discussed models for the burst and the afterglow include a regular GRB jet seen off-axis and the emission from the cocoon encompassing a "choked" jet. Here, we report low radio-frequency observations at 610 and 1390~MHz obtained with the Giant Metrewave Radio Telescope (GMRT). Our observations span a range of $\sim 7$ to $\sim 152$ days after the burst. The afterglow started to emerge at these low frequencies about 60~days after the burst. The $1390$~MHz light curve barely evolved between 60 and 150 days, but its evolution is also marginally consistent with a $F_{\nu }\propto t^{0.8}$ rise seen in higher frequencies. We model the radio data and archival X-ray, optical and high-frequency radio data with models of top-hat and Gaussian structured GRB jets. We performed a Markov Chain Monte Carlo analysis of the structured-jet parameter space. Though highly degenerate, useful bounds on the posterior probability distributions can be obtained. Our bounds of the viewing angle are consistent with that inferred from the gravitational wave signal. We estimate the energy budget in prompt emission to be an order of magnitude lower than that in the afterglow blast-wave.

arXiv commentPublished in The Astrophysical Journal

References in corpus (35)

• emcee: The MCMC Hammer
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi-GBM Detection of GRB 170817A
• Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
• The X-ray counterpart to the gravitational wave event GW 170817
• Illuminating Gravitational Waves: A Concordant Picture of Photons from a Neutron Star Merger
• The Emergence of a Lanthanide-Rich Kilonova Following the Merger of Two Neutron Stars
• Optical emission from a kilonova following a gravitational-wave-detected neutron-star merger
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. I. Dark Energy Camera Discovery of the Optical Counterpart
• 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 Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. V. Rising X-ray Emission from an Off-Axis Jet
• A mildly relativistic wide-angle outflow in the neutron star merger GW170817
• 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
• The outflow structure of GW170817 from late time broadband observations
• MASTER optical detection of the first LIGO/Virgo neutron stars merging GW170817
• A Deep Chandra X-ray Study of Neutron Star Coalescence GW170817
• Afterglow Observations of Fermi-LAT Gamma-Ray Bursts and the Emerging Class of Hyper-Energetic Events
• The evolution of the X-ray afterglow emission of GW 170817 / GRB 170817A in XMM-Newton observations
• Constraints on the ejecta of the GW170817 neutron-star merger from its electromagnetic emission
• The Distance to NGC 4993: The Host Galaxy of the Gravitational-wave Event GW170817
• Electromagnetic Counterparts to Structured Jets from Gravitational Wave Detected Mergers
• The Angular Size and Proper Motion of the Afterglow of GRB 030329
• A turnover in the radio light curve of GW170817
• Gamma-ray burst afterglow broadband fitting based directly on hydrodynamics simulations
• Off-Axis Emission of Short GRB Jets from Double Neutron Star Mergers and GRB 170817A
• Structure of Gamma-Ray Burst jets: intrinsic versus apparent properties
• An Off-Axis Jet Model For GRB980425 and Low Energy Gamma-Ray Bursts
• Implications of the radio and X-ray emission that followed GW170817
• ALMA and GMRT constraints on the off-axis gamma-ray burst 170817A from the binary neutron star merger GW170817
• The Importance of Off-Jet Relativistic Kinematics in Gamma-Ray Burst Jet Models

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