Workflow

The workflow was described initially in Hancock et al. 2018 however the current workflow is shown below:

• Preprocessing:

  • Convolve all images to a common psf (optional)

  • Create background and noise maps (if they are not found)

  • Correct astrometry using fitswarp (optional)

• Variabile/persistent source detection:

  • Stack the warped images to form a mean image

  • Source find on the mean image to make a reference catalogue

  • Priorized fit this catalogue into each of the individual images

  • Join the epoch catalogues to make a persistent source catalogue

  • Calculate variability stats and generate a light curve for each source

• Transient candidate identification:

  • Use the persistent source to mask known sources from the individual epochs

  • Source find on the masked images to find transients

  • Concatenate transients into a single catalogue, identifying the epoch of each detection

flowchart TD subgraph Preprocessing direction LR img[Raw images] --> psf["PSF correction (?)"] psf --> bkg[Create background/noise maps] bkg --> warp["Fits warping (?)"] warp --> epim[Epoch images] end subgraph Persistent sources epim --> mean[Mean image] mean --> pscat[Persistent sources] epim --> pscat pscat --> vout[(Flux table, variability table, light curves, variabiltiy plot)] end subgraph Transients mean --> mask[Masked epoch images] epim --> mask pscat --> mask mask --> trans[Transient candidates] trans --> tout[(Filtered candidates, transients plot)] end

Items with a (?) are optional processing steps that can be turned on/off. Items in a cylinder are the final outputs of the processing workflow.