A new Bayesian analysis of VLBI observations of GW170817's jet afterglow constrains the viewing angle to 16.8-19.2 degrees and measures H0 = 65.5 ± 4.4 km s^{-1} Mpc^{-1}, closer to Planck than SH0ES values.
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GPU-accelerated nested sampling on GW170817 demonstrates that switching to a uniform-in-dL prior shifts the H0 tail and median far more than post-hoc reweighting captures, due to an under-sampled (dL, iota) bimodality.
GW190814 is proposed to originate from a collapsar-disk fragment merging with the central black hole, potentially preceded by SN2019npv ~60 days earlier, yielding H0 = 70.5 (+9.2, -6.4) km/s/Mpc.
No kilonova detected from sub-solar GW candidate S251112cm, but coincident IIb supernova SN 2025adtq yields suggestive evidence for the superkilonova channel, though inconclusive after accounting for chance coincidence.
A faint radio counterpart to SN 2025ulz was detected at 6-10 GHz, consistent with either supernova ejecta interacting with circumstellar material or an off-axis jet, supporting possible superkilonova scenarios.
Overview of SKAO's role in radio follow-up of GW events, GRB afterglows, and kilonovae for system characterization and population studies.
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Rapid Hubble constant inference from GW170817 using GPU-accelerated nested sampling: prior sensitivity and the limits of post-hoc reweighting
GPU-accelerated nested sampling on GW170817 demonstrates that switching to a uniform-in-dL prior shifts the H0 tail and median far more than post-hoc reweighting captures, due to an under-sampled (dL, iota) bimodality.