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.
Gravitational Instability and Fragmentation in Collapsar Disks Supports the Formation of Subsolar Neutron Stars
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No sub-solar mass binary merger candidates found in LIGO data from May 2023 to January 2024, yielding merger rate upper limits of 110-10000 Gpc^{-3}yr^{-1} and constraints on primordial black hole dark matter fractions.
SN2025ulz is a type IIb supernova whose shock-cooling tail mimicked a kilonova, demonstrating a key contaminant for gravitational-wave counterpart searches.