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Your search keyword '"Barthelemy, S."' showing total 2 results
Start Over Author "Barthelemy, S." Topic gamma ray bursts
2 results on '"Barthelemy, S."'

1. GRB 050904: the oldest cosmic explosion ever observed in the Universe.

Author

Cusumano, G., Mangano, V., Chincarini, G., Panaitescu, A., Burrows, D. N., La Parola, V., Sakamoto, T., Campana, S., Mineo, T., Tagliaferri, G., Angelini, L., Barthelemy, S. D., Beardmore, A. P., Boyd, P. T., Cominsky, L. R., Gronwall, C., Fenimore, E. E., Gehrels, N., Giommi, P., and Goad, M.

Subjects
GAMMA ray telescopes, SPECTRAL energy distribution, SPECTRUM analysis, GAMMA ray bursts, REDSHIFT, ASTRONOMY, PHYSICS
Abstract

Swift discovered the high redshift (z=6.29) GRB 050904 with the Burst Alert Telescope and began observing with its narrow field instruments only 161 s after the burst onset. GRB 050904 was a long, multi-peaked, bright GRB with a presence of flaring activity lasting up to 1–2 hours after the burst onset. The spectral energy distribution shows a clear softening trend along the burst evolution with a photon index decreasing from -1.2 up to -1.9. The observed variability is more dramatic than the typical Swift afterglow, the amplitude and rise/fall times of the flares are consistent with the behavior of nearby (z ≤ 1) long GRBs and suggest the interpretation of the BAT and XRT data as a single continuous observation of long lasting prompt emission. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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2. Gamma-ray bursts: Huge explosion in the early Universe.

Author

Cusumano, G., Mangano, V., Chincarini, G., Panaitescu, A., Burrows, D. N., Parola, V. La, Sakamoto, T., Campana, S., Mineo, T., Tagliaferri, G., Angelini, L., Barthelemy, S. D., Beardmore, A. P., Boyd, P. T., Cominsky, L. R., Gronwall, C., Fenimore, E. E., Gehrels, N., Giommi, P., and Goad, M.

Subjects
STAR formation, REDSHIFT, GAMMA ray bursts, GALAXIES, X-ray astronomy, GRAVITATIONAL collapse
Abstract

Long gamma-ray bursts (GRBs) are bright flashes of high-energy photons that can last for tens of minutes; they are generally associated with galaxies that have a high rate of star formation and probably arise from the collapsing cores of massive stars, which produce highly relativistic jets (collapsar model). Here we describe γ- and X-ray observations of the most distant GRB ever observed (GRB 050904): its redshift (z) of 6.29 means that this explosion happened 12.8 billion years ago, corresponding to a time when the Universe was just 890 million years old, close to the reionization era. This means that not only did stars form in this short period of time after the Big Bang, but also that enough time had elapsed for them to evolve and collapse into black holes. [ABSTRACT FROM AUTHOR]

Published
2006
Full Text
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