We present radio and infrared (3.6-24 μm) counterparts to
submillimetre galaxies (SMGs) detected in the Extended Chandra Deep
Field-South with the Large APEX Bolometer Camera (LABOCA) 870-μm
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) >
3.7, S870 > 4.4 mJy] in the field, 62 via their radio
and/or 24-μm emission, the remainder using a colour-flux cut on
Infrared Array Camera 3.6- and 5.8-μm sources chosen to maximize the
number of secure, coincident radio and 24-μm 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 ? (1σ errors) for the secure radio
counterparts, in agreement with other studies, both spectroscopic and
photometric.