TruemorsThat is how astronomers spot supernovae on the sky
Supernova cosmology project
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NP! ID: 965240
Title: Supernova cosmology project
Created: Thu, 05/15/2008 - 6:02am
File Type: image (jpeg)
Modified: Thu, 05/15/2008 - 6:02am
File Size: 500 × 498 – 179.62 KB
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darweterat 06:06 on May 15th, 2008
That's a catalogue of supernovae (data by SDSS as far as I remember). Anyway, that is how astronomers pick supernovae - they continuously scan the sky (wide coverage) trying to notice some new bright spots within a galaxy etc. Typical supernova is as bright as the galaxy it belongs to.