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Massive and supermassive stars at very low<br />
abundances<br />
• Massive star formation from redshift 80?<br />
• Massive star HII region<br />
• Massive star explosions?<br />
• Hyper Nova Remnant (HNR)<br />
• Stellar mass black holes?<br />
17<br />
• Gamma Ray Bursts?<br />
• Gamma emission redshifted to soft X-rays<br />
• Time scale of a few seconds shifted to minute<br />
• Search strategy to detect extremely high-z GRBs?
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