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We present radio and infrared (3.6–24  μ m) counterparts to submillimetre galaxies (SMGs) detected in the  Extended Chandra Deep Field ‐South with the Large APEX Bolometer Camera (LABOCA) 870‐ μ m bolometer camera on the 12‐m Atacama Pathfinder Experiment. Using the Very Large Array at 1.4 GHz and  Spitzer , we have identified secure counterparts to 79 of the 126 SMGs [signal‐to‐noise ratio  (S/N) &gt; 3.7,  S  870  &gt; 4.4  mJy] in the field, 62 via their radio and/or 24‐ μ m emission, the remainder using a colour‐flux cut on Infrared Array Camera 3.6‐ and 5.8‐ μ m sources chosen to maximize the number of secure, coincident radio and 24‐ μ m counterparts. In constructing our radio catalogue, we have corrected for the effects of ‘flux boosting’, then used the corrected flux densities to estimate the redshifts of the SMGs based on the radio/submm spectral indices. The effect of the boosting correction is to increase the median redshift by 0.2 resulting in a value of  (1 σ  errors) for the secure radio counterparts, in agreement with other studies, both spectroscopic and photometric.

The LABOCA survey of the Extended Chandra Deep Field ‐South – radio and mid‐infrared counterparts to submillimetre galaxies