Low frequency view of GW 170817/GRB 170817A with the Giant Meterwave Radio Telescope
L. Resmi, S. Schulze, C. H. Ishwara Chandra, K. Misra, J. Buchner, M., De Pasquale, R. Sanchez Ramirez, S. Klose, S. Kim, N. R. Tanvir, P. T., O'Brien

TL;DR
This study presents low-frequency radio observations of GW 170817/GRB 170817A, revealing afterglow emergence around 60 days post-burst and constraining jet structure and viewing angle through modeling and MCMC analysis.
Contribution
First low-frequency radio observations of GW 170817/GRB 170817A, combined with multi-wavelength data, to model jet structure and estimate viewing angles using MCMC methods.
Findings
Afterglow emerged at ~60 days at low frequencies.
Radio light curve evolution is consistent with higher frequency trends.
Bounds on viewing angle align with gravitational wave estimates.
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 -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 to days after the burst. The afterglow started to emerge at these low frequencies about 60~days after the burst. The ~MHz light curve barely evolved between 60 and 150 days, but its evolution is also marginally consistent with a rise seen in higher frequencies. We model the…
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