A&A 468, 83–96 (2007) Astronomy DOI: 10.1051/0004-6361:20066780 & c ESO 2007 Astrophysics Rapid-response mode VLT/UVES spectroscopy of GRB 060418 Conclusive evidence for UV pumping from the time evolution of Fe II and Ni II excited- and metastable-level populations P. M. Vreeswijk1,2, C. Ledoux1, A. Smette1, S. L. Ellison3, A. O. Jaunsen4,M.I.Andersen5,A.S.Fruchter6, J. P. U. Fynbo7, J. Hjorth7,A.Kaufer1, P. Møller8, P. Petitjean9,10,S.Savaglio11, and R. A. M. J. Wijers12 1 European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago 19, Chile e-mail:
[email protected] 2 Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile 3 Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada 4 Institute of Theoretical Astrophysics, University of Oslo, PO Box 1029 Blindern, 0315 Oslo, Norway 5 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany 6 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA 7 Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark 8 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany 9 Institut d’Astrophysique de Paris – UMR 7095 CNRS & Université Pierre et Marie Curie, 98bis Boulevard Arago, 75014 Paris, France 10 LERMA, Observatoire de Paris, 61 Avenue de l’Observatoire, 75014 Paris, France 11 Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85748 Garching bei München, Germany 12 Astronomical Institute “Anton Pannekoek”, University of Amsterdam & Center for High Energy Astrophysics, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands Received 20 November 2006 / Accepted 11 March 2007 ABSTRACT We present high-resolution spectroscopic observations of GRB 060418, obtained with VLT/UVES.