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Swift XRT and VLT Observations of the Afterglow of GRB 041223

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posted on 2018-05-15, 15:22 authored by D. N. Burrows, J. E. Hill, G. Chincarini, G. Tagliaferri, S. Campana, A. Moretti, P. Romano, D. Malesani, J. L. Racusin, S. Kobayashi, B. Zhang, P. Meszaros, P. T. O'Brien, R. Willingale, Julian Paul Osborne, G. Cusumano, P. Giommi, L. Angelini, A. F. Abbey, L. A. Antonelli, A. P. Beardmore, M. Capalbi, S. Covino, P. D'Avanzo, M. R. Goad, J. A. Kennea, D. C. Morris, C. Pagani, K. L. Page, L. Stella, J. A Nousek, A. A. Wells, N. Gehrels
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 1farcs1 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 × 10-12 ergs cm-2 s-1 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.

History

Citation

Astrophysical Journal, 2005, 622 (2)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • AM (Accepted Manuscript)

Published in

Astrophysical Journal

Publisher

American Astronomical Society

issn

0004-637X

eissn

1538-4357

Copyright date

2005

Available date

2018-05-15

Publisher version

http://iopscience.iop.org/article/10.1086/429666/meta

Language

en

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