Swift X-Ray Telescope and Very Large Telescope Observations of the Afterglow of GRB 041223

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. Mészáros; P. T. O’Brien; R. Willingale; J. P. 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

doi:10.1086/429666

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Swift X-Ray Telescope and Very Large Telescope Observations of the Afterglow of GRB 041223

D. N. Burrows¹, J. E. Hill¹, G. Chincarini^2,3, G. Tagliaferri², S. Campana², A. Moretti², P. Romano², D. Malesani⁴, J. L. Racusin¹, S. Kobayashi^1,5, B. Zhang⁶, P. Mészáros¹, P. T. O'Brien⁷, R. Willingale⁷, J. P. Osborne⁷, G. Cusumano⁸, P. Giommi⁹, L. Angelini^10,11, A. F. Abbey¹², L. A. Antonelli¹³, A. P. Beardmore⁷, M. Capalbi⁹, S. Covino², P. D'Avanzo³, M. R. Goad⁷, J. A. Kennea¹, D. C. Morris¹, C. Pagani^1,2, K. L. Page⁷, L. Stella¹³, J. A. Nousek¹, A. A. Wells¹², and N. Gehrels¹⁰

Published 2005 March 9 • © 2005. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 622, Number 2 Citation D. N. Burrows et al 2005 ApJ 622 L85 DOI 10.1086/429666

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¹ Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802

² INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy

³ Dipartimento di Fisica, Università degli studi di Milano-Bicocca, Piazza delle Scienze 3, 20126 Milan, Italy

⁴ International School for Advanced Studies, SISSA-ISAS, via Beirut 2-4, 34014 Trieste, Italy

⁵ Center for Gravitational Wave Physics, Pennsylvania State University, University Park, PA 16802

⁶ Department of Physics, University of Nevada, Box 454002, Las Vegas, NV 89154-4002

⁷ Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK

⁸ INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Sezione di Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy

⁹ ASI Science Data Center, via Galileo Galilei, 00044 Frascati, Italy

¹⁰ NASA/Goddard Space Flight Center, Greenbelt, MD 20771

¹¹ Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218

¹² Space Research Centre, University of Leicester, Leicester LE1 7RH, UK

¹³ INAF-Osservatorio Astronomico di Roma, via di Frascati 33, 00040 Monteporzio, Italy

Dates

Received 2005 January 21
Accepted 2005 February 15
Published 2005 March 9

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Abstract

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 farcs 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^-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.

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Swift X-Ray Telescope and Very Large Telescope Observations of the Afterglow of GRB 041223

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