1. Introduction  
2. Sub-banded search algorithm  
2.1. Design  
2.2. Detection gain  
3. Reprocessing of the HTRU South survey  
3.1. Observations  
3.2. Data analysis  
4. Results and discussion  
4.1. Bursts re-detected  
4.2. New detections  
4.3. Parameter distributions  
5. Summary and conclusions