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Methyl cyanide is an important trace molecule in space, especially instar-forming regions where it is one of the more common molecules used toderive kinetic temperatures. We want to obtain accurate spectroscopicparameters of minor isotopologs of methyl cyanide in their lowest excited $v_8= 1$ vibrational states to support astronomical observations, in particular,with interferometers such as ALMA. The laboratory rotational spectrum of methylcyanide in natural isotopic composition has been recorded from the millimeterto the terahertz regions. Transitions with good signal-to-noise ratios could beidentified for the three isotopic species CH$_3^{13}$CN, $^{13}$CH$_3$CN, andCH$_3$C(15)N up to about 1.2 THz ($J'' \le 66$). Accurate spectroscopicparameters were obtained for all three species. The present data were alreadyinstrumental in identifying $v_8 = 1$ lines of methyl cyanide with one $^{13}$Cin IRAM 30 m and ALMA data toward Sagittarius B2(N).

Rotational spectra of isotopic species of methyl cyanide, CH$_3$CN, in their $v_8 = 1$ excited vibrational states