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We present Yebes 40m telescope observations of the three most stable C4H3Nisomers towards the cyanopolyyne peak of TMC-1. We have detected 13 transitionsfrom CH3C3N (A and E species), 16 lines from CH2CCHCN, and 27 lines (a-type andb-type) from HCCCH2CN. We thus provide a robust confirmation of the detectionof HCCCH2CN and CH2CCHCN in space. We have constructed rotational diagrams forthe three species, and obtained rotational temperatures between 4-8 K andsimilar column densities for the three isomers, in the range (1.5-3)e12 cm-2.Our chemical model provides abundances of the order of the observed ones,although it overestimates the abundance of CH3CCCN and underestimates that ofHCCCH2CN. The similarity of the observed abundances of the three isomerssuggests a common origin, most probably involving reactions of the radical CNwith the unsaturated hydrocarbons methyl acetylene and allene. Studies ofreaction kinetics at low temperature and further observations of thesemolecules in different astronomical sources are needed to draw a clear pictureof the chemistry of C4H3N isomers in space.

A study of C4H3N isomers in TMC-1: line by line detection of HCCCH2CN