Rotational structure in the A-X system of the indium monobromide molecule has been studied with moderately high resolution. Five bands, namely (2, 0), (1, 0), (0, 0) (0, 1) and (0, 2), were rotationally analysed and rotational constants were determined in the A and the X states for both the isotopic molecules In 79Br and In 81Br. Predissociation has been observed at J=134 in the upsilon =2 level of the A 3 Pi 0 state. This gives an upper limit to the dissociation energy of the InBr molecule of 3.5 eV.
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