The ability to quickly detect transient sources in optical images and trigger multi-wavelength follow up is key for the discovery of fast transients .
These include events rare and difficult to detect such as kilonovae , supernova shock breakout , and “ orphan ” Gamma-ray Burst afterglows .
We present the Mary pipeline , a ( mostly ) automated tool to discover transients during high-cadenced observations with the Dark Energy Camera ( DECam ) at CTIO .
The observations are part of the “ Deeper Wider Faster ” program , a multi-facility , multi-wavelength program designed to discover fast transients , including counterparts to Fast Radio Bursts and gravitational waves .
Our tests of the Mary pipeline on DECam images return a false positive rate of \sim 2.2 \% and a missed fraction of \sim 3.4 \% obtained in less than 2 minutes , which proves the pipeline to be suitable for rapid and high-quality transient searches .
The pipeline can be adapted to search for transients in data obtained with imagers other than DECam .