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http://hdl.handle.net/2445/45374
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DC Field | Value | Language |
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dc.contributor.author | Castro-Tirado, A. J. | - |
dc.contributor.author | Sokolov, V. V. | - |
dc.contributor.author | Castro Cerón, J. M. | - |
dc.contributor.author | Zapatero-Osorio, M. R. | - |
dc.contributor.author | Caon, N. | - |
dc.contributor.author | Blake, C. | - |
dc.contributor.author | Wall, J. | - |
dc.contributor.author | Benetti, S. | - |
dc.contributor.author | Magazzù, Alessandro | - |
dc.contributor.author | Ghinassi, F. | - |
dc.contributor.author | Paredes i Poy, Josep Maria | - |
dc.contributor.author | Martí Ribas, Josep | - |
dc.contributor.author | Xanthopoulos, E. | - |
dc.contributor.author | Kristen, H. E. | - |
dc.contributor.author | Smoker, J. | - |
dc.contributor.author | Hurley, K. | - |
dc.date.accessioned | 2013-08-26T12:14:44Z | - |
dc.date.available | 2013-08-26T12:14:44Z | - |
dc.date.issued | 2001 | - |
dc.identifier.issn | 0004-6361 | - |
dc.identifier.uri | http://hdl.handle.net/2445/45374 | - |
dc.description.abstract | Observations of the extraordinarily bright optical afterglow (OA) of GRB 991208 started 2.1 d after the event. The flux decay constant of the OA in the R-band is -2.30 +/- 0.07 up to 5 d, which is very likely due to the jet effect, and after that it is followed by a much steeper decay with constant -3.2 +/- 0.2, the fastest one ever seen in a GRB OA. A negative detection in several all-sky films taken simultaneously to the event implies either a previous additional break prior to 2 d after the occurrence of the GRB (as expected from the jet effect). The existence of a second break might indicate a steepening in the electron spectrum or the superposition of two events. Once the afterglow emission vanished, contribution of a bright underlying SN is found, but the light curve is not sufficiently well sampled to rule out a dust echo explanation. Our determination of z = 0.706 indicates that GRB 991208 is at 3.7 Gpc, implying an isotropic energy release of 1.15 x 10E53 erg which may be relaxed by beaming by a factor > 100. Precise astrometry indicates that the GRB coincides within 0.2' with the host galaxy, thus given support to a massive star origin. The absolute magnitude is M_B = -18.2, well below the knee of the galaxy luminosity function and we derive a star-forming rate of 11.5 +/- 7.1 Mo/yr. The quasi-simultaneous broad-band photometric spectral energy distribution of the afterglow is determined 3.5 day after the burst (Dec 12.0) implying a cooling frequency below the optical band, i.e. supporting a jet model with p = -2.30 as the index of the power-law electron distribution. | - |
dc.format.extent | 9 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Springer Verlag | - |
dc.relation.isformatof | Versió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361:20010247 | - |
dc.relation.ispartof | Astronomy and Astrophysics, 2001, vol. 370, p. 398-406 | - |
dc.relation.uri | http://dx.doi.org/10.1051/0004-6361:20010247 | - |
dc.rights | (c) Springer Verlag, 2001 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Astronomia de raigs gamma | - |
dc.subject.classification | Raigs gamma | - |
dc.subject.classification | Galàxies | - |
dc.subject.classification | Cosmologia | - |
dc.subject.classification | Esclat de raigs gamma | - |
dc.subject.other | Gamma ray astronomy | - |
dc.subject.other | Gamma rays | - |
dc.subject.other | Galaxies | - |
dc.subject.other | Cosmology | - |
dc.subject.other | Gamma ray bursts | - |
dc.title | The extraordinarily bright optical afterglow of GRB 991208 and its host galaxy | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 186501 | - |
dc.date.updated | 2013-08-26T12:14:44Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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186501.pdf | 294.08 kB | Adobe PDF | View/Open |
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