Target source observations
LABOCA regular observing mode is in continuous integration. Since it is a DC-coupled instrument, thus this switching mode needs to be combined with one of the following observing patterns:
Depending on the source size, a target is usually observed through a raster map in spiral mode or an OTF map. By introducing offsets from the catalog position (mosaic), also large or irregularly shaped objects can be mapped with a homogenous noise over the area of interest. See further below to know when this mosaic technique is recommended.
The wobbler on-off mode was decommissioned in July 2016. This mode was used to obtain flux determinations of faint compact sources.
In addition, there exist a few observing methods especially for calibration observations.
Absolute flux calibration is performed by a raster map in spiral mode on a planet or a secondary calibrator. See the calibration section for details.
Observing strategy depending on the target
The observing patterns described above can be customised in order to provide a homogenous coverage of the area of interest. In addition, LABOCA’s reference channel can be changed to a more sensitive one than that in the geometric centre. In the following we give an overview over various observing strategies for various source sizes.