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22nd of July 2020
Multi-wavelength monitoring of GW 170817
by Makhathini et al.
Makhathini et al. present a multi-wavelength afterglow light curve data of the neutron star--neutron star merger, GW170817, ranging from 0.5 and 940 days post-merger. By compiling all archival data (including ATCA data), and reprocessing a subset of it, they have ensured that the panchromatic dataset is uniform and therefore immune to the differences in data processing or flux determination methods used by different groups. Simple fits to the light curve indicate a power-law rise, a peak occurring at 155 ± 4 days, and a power-law decline. Using the late-time afterglow data they place constraints on any long-lived neutron star remnant. The figure above shows the multi-wavelength (radio, optical and X-ray) afterglow light curve of GW170817, color coded according to the observing frequency, up to 940 days post-merger (upper limits are not shown) using the uniform dataset presented in this work. The light curve is scaled to 3 GHz using the best-fit spectral index (−0.57) derived from the data. The paper has been submitted to the Astrophysical Journal.

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