near: A-team sources - need demixing Sun - e.g. solar flares Galactic plane - source confusion Other things that might be important: Time of day - particularly for LBA Low elevation - prone to more RFI Lack of sources in skymodel - not an issue if using a calibrator = Version 1 First identified and studied by A. Stewart & R. Breton (MSSS report week 41 and talk yesterday)
be suffering from severe RFI particular baselines - causes poor uv coverage particular station types - causes poor uv coverage = Version 1 See work by Y. Cendes for more details about flagging and transient searches
weight spectrum values Features in images such as stripes due to bad calibration - possibly use the stripy image detection script developed for MSSS = Version 1 MSSS report Week 42: R. Breton, D. Carbone, V. Heeson
the theoretical noise Restoring beam: Beam undersampled or significantly oversampled Beam highly elliptical = Version 1 Already Im plem ented in TraP Over sampled Under sampled Normal
check flux scale and position offsets Extract brightest sources from image Basic source association using the beam FWHM and sky model Calculate average position offset - systematic position errors Calculate average flux ratio - incorrect flux scale in image = Version 1 MSSS report Week 28: A. Rowlinson
fits FWHM of fit is smaller than restoring beam Spectrum unrealistic Not flagging sources in the catalogue but when they are extracted, therefore thresholds are all user defined = Version 1
close to a bright source Over density of transients close to bright sources - further study required At peaks in the PSF for bright sources Systematic effects: Specific transient is very close to image edge Over density of transients near image edge or with specific RA/ Dec - further study required = Version 1