Titlebook: Supernovae and Gamma-Ray Bursters; Kurt W. Weiler Book 2003 Springer-Verlag Berlin Heidelberg 2003 Cosmology.gamma-ray bursts.standard can

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0075-8450 observers of the sky have wondered at the sudden appearance of new stars on the seemingly unchanging heavens and, for at least 2000 years, have recorded these phenomena in their annals and archives. Even in more modern times, since the discovery of SN1885A in S Andromeda which ?gured in the importa

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Optical Observations of γ-Ray Burst Afterglowsission line spectra, as well as host galaxy brightnesses and colors have clarified many fundamental issues related to the radiation mechanisms and environments of GRBs, setting the background towards discovering the nature of their progenitors.

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