Two C-O stretching hot bands, (v(1) + 2v(3)) - 2v(3) and (2v(1) + v(3)) - (v(1) + v(3)), of the CCO radical in the ground electronic state were measured. These hot bands are red shifted by approximately 70 cm(-1) compared to the C-O stretching fundamental. CCO was produced in a discharge through a flowing mixture of carbon suboxide and helium. The spectra were recorded using a diode laser spectrometer. The band origins were determined to be 1904.32512(62) and 1902.69130(56) cm(-1) for (v(1) + 2v(3)) - 2v(3) and (2v(1) + v(3)) - (v(1) + v(3)), respectively. The measurements in this band together with previously reported frequencies in the C-C and C-O stretching regions were analysed to determine harmonic frequencies and anharmonicity constants. (c) 2005 Elsevier B.V. All rights reserved.