Given its presumed importance in prebiotic chemistry, it is no surprise that cyanoacetylene has been an observational target for diverse astronomical environ-ments. In addition to its relevance to prebiotic chemistry, the observation of cyanoacetylene at astrophysical objects contributes to an understanding of their conditions (thermodynamics, isotopic abundances, solid-/gasphase chemistry, etc.). For example, the observation of gaseous cyanoacetylene in the coma of Hale-Bopp led to questions about whether this chemical species originates in the solid comet nucleus or was formed in gas-phase reactions in the coma . Similar puzzles exist on Titan, with its nitrogen/methane atmosphere, where the observation of cyanoacetylene isotopologues revealed the role that photochemistry plays in nitrogen isotope abundance ratios . Interstellar detections of cyanoacetylene began in 1971 with its observation toward Sagittarius B2 , where it was already noted to likely not be thermalized with the local environment. Given its low-frequency bending modes, many studies have since found evidence for vibrationally excited cyanoacetylene toward other sources, including a recent extensive survey of hot cores .