TruemorsThat is how astronomers spot supernovae on the sky
Supernova cosmology project
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Major NASA Announcement, Supernova found in Our Galaxy
Major NASA Announcement , Object found in Our Galaxy
We will post a streaming link when NASA Listen Here The most recent supernova in our Galaxy has been discovered by tracking the rapid expansion of its... 
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NP! ID: 965240
Title: Supernova cosmology project
Created: Thu, 05/15/2008 - 3:02am
File Type: image (jpeg)
Modified: Thu, 05/15/2008 - 3:02am
File Size: 500 × 498 – 179.62 KB
Licence: None (All rights reserved)
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darweterat 03:06 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.