1. Introduction  
2. Observations  
2.1. VLA data calibration  
2.2. Spectral line data imaging  
2.3. Complementary continuum data  
3. Source extraction  
3.1. Source extraction code  
3.2. Catalogue creation  
4. Results  
4.1. Detections  
4.2. Flux densities  
4.3. Distance determination  
4.4. Luminosity  
4.5. Comparison with other maser surveys  
4.6. Absorption detections  
5. Discussion  
5.1. Association with ATLASGAL sources  
5.2. Association with radio continuum  
5.3. Luminosity function  
6. Summary and Conclusions