The Swift/FermiGRB 080928 from 1 eV to 150 keV
| Autor: | A. Rossi, S. Schulze, S. Klose, D. A. Kann, A. Rau, H. A. Krimm, G. Jóhannesson, A. Panaitescu, F. Yuan, P. Ferrero, T. Krühler, J. Greiner, P. Schady, S. B. Pandey, L. Amati, P. M. J. Afonso, C. W. Akerlof, L. A. Arnold, C. Clemens, R. Filgas, D. H. Hartmann, A. Küpcü Yoldaş, S. McBreen, T. A. McKay, A. Nicuesa Guelbenzu, F. E. Olivares, B. Paciesas, E. S. Rykoff, G. Szokoly, A. C. Updike, A. Yoldaş |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena Synchrotron radiation Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Light curve Galaxy Afterglow law.invention Space and Planetary Science law Spectral energy distribution Astrophysics - High Energy Astrophysical Phenomena Gamma-ray burst Fermi Gamma-ray Space Telescope Flare |
| Zdroj: | Astronomy & Astrophysics. 529:A142 |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361/201015324 |
| Popis: | We present the results of a comprehensive study of the gamma-ray burst 080928 and of its afterglow. GRB 080928 was a long burst detected by Swift/BAT and Fermi/GBM. It is one of the exceptional cases where optical emission had already been detected when the GRB itself was still radiating in the gamma-ray band. For nearly 100 seconds simultaneous optical, X-ray and gamma-ray data provide a coverage of the spectral energy distribution of the transient source from about 1 eV to 150 keV. In particular, we show that the SED during the main prompt emission phase agrees with synchrotron radiation. We constructed the optical/near-infrared light curve and the spectral energy distribution based on Swift/UVOT, ROTSE-IIIa (Australia), and GROND (La Silla) data and compared it to the X-ray light curve retrieved from the Swift/XRT repository. We show that its bumpy shape can be modeled by multiple energy-injections into the forward shock.Furthermore, we investigate whether the temporal and spectral evolution of the tail emission of the first strong flare seen in the early X-ray light curve can be explained by large-angle emission (LAE). We find that a nonstandard LAE model is required to explain the observations. Finally, we report on the results of our search for the GRB host galaxy, for which only a deep upper limit can be provided. Comment: A&A, in press (including revisions according to the language editor), 14 pages, 11 figures, 7 tables; Online Appendix: 4 pages, 1 figure, 4 tables; v4: final journal version to be published soon |
| Databáze: | OpenAIRE |
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