GRB 041223 was the first gamma-ray burst detected by the Swift X-Ray Telescope (XRT), beginning 4.6 hr after the burst. The X-ray detection triggered a VLT observation of the optical/near-infrared (NIR) counterpart, located about 1″.1 from the XRT position. The X-ray counterpart faded rapidly, with a power-law index of - 1.72 ± 0.20, with an average unabsorbed X-ray flux of 6.5 × 10<sup>-12</sup> ergs cm<sup>-2</sup> s<sup>-1</sup> in the 0.5-10 keV band for a power-law spectrum of photon index 2.02 ± 0.13 with Galactic absorption. The NIR counterpart was observed at three epochs between 16 and 87 hr after the burst and faded with a power-law index of -1.14 ± 0.08 with a reddening-corrected spectral energy distribution power-law slope of -0.40 ± 0.03. We find that the X-ray and NIR data are consistent with a two-component jet in a wind medium. © 2005. The American Astronomical Society. All rights reserved.
Burrows, D.N., Hill, J.E., Chincarini, G., Tagliaferri, G., Campana, S., Moretti, A., et al. (2005). Swift X-Ray Telescope and Very Large Telescope Observations of the Afterglow of GRB 041223. THE ASTROPHYSICAL JOURNAL, 622(2), L85-L88.
Citazione: | Burrows, D.N., Hill, J.E., Chincarini, G., Tagliaferri, G., Campana, S., Moretti, A., et al. (2005). Swift X-Ray Telescope and Very Large Telescope Observations of the Afterglow of GRB 041223. THE ASTROPHYSICAL JOURNAL, 622(2), L85-L88. |
Tipo: | Articolo in rivista - Articolo scientifico |
Carattere della pubblicazione: | Scientifica |
Titolo: | Swift X-Ray Telescope and Very Large Telescope Observations of the Afterglow of GRB 041223 |
Autori: | Burrows, DN; Hill, JE; Chincarini, G; Tagliaferri, G; Campana, S; Moretti, A; Romano, P; Malesani, D; Racusin, JL; Kobayashi, S; Zhang, B; Mészáros, P; O'Brien, PT; Willingale, R; Osborne, JP; Cusumano, G; Giommi, P; Angelini, L; Abbey, AF; Antonelli, LA; Beardmore, AP; Capalbi, M; Covino, S; D'Avanzo, P; Goad, MR; Kennea, JA; Morris, DC; Pagani, C; Page, KL; Stella, L; Nousek, JA; Wells, AA; Gehrels, N |
Autori: | |
Data di pubblicazione: | 1-apr-2005 |
Lingua: | English |
Rivista: | THE ASTROPHYSICAL JOURNAL |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1086/429666 |
Appare nelle tipologie: | 01 - Articolo su rivista |