A revised HST/F606W afterglow light curve for GW170817 confirms an off-axis structured jet, finds no spectral evolution from radio to X-rays, and places a 4 sigma limit ruling out a globular cluster origin for the merger.
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The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster Origin
A revised HST/F606W afterglow light curve for GW170817 confirms an off-axis structured jet, finds no spectral evolution from radio to X-rays, and places a 4 sigma limit ruling out a globular cluster origin for the merger.