What is the 'faint regime' in cosmological explosions?

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What do they mean with "faint regime", when they talk about cosmological explosions?? (e.g X-ray flashes)

thnx
 
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I have no idea, can you give us a link to the paper you are reading? I'm guessing they're speaking of objects that are far away and therefore aren't very bright (i.e. low flux). Though it's also possible they're referring to some technical class of objects that are intrinsically faint (i.e. low luminosity).