... galaxy

Based on observations made with ESO Telescopes at the Paranal and La Silla Observatories under programmes 165.H-0464 and 265.D-5742, with the Italian Telescopio Nazionale Galileo and with the Nordic Optical Telescope (NOT), both operating on the island of La Palma in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. The NOT is operated jointly by Denmark, Finland, Iceland, Norway, and Sweden.

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... GRACE

GRB Afterglow Collaboration at ESO: see the web page http://www.gammaraybursts.org/grace/

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... MIDAS

MIDAS (Munich Image Data Analysis System) is developed, distributed and maintained by ESO (European Southern Observatory) and is available at http://www.eso.org/projects/esomidas

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... archive

GCN Circulars are available at: http://gcn.gsfc.nasa.gov/gcn/gcn3_archive.html

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... packages

IRAF is the Image Analysis and Reduction Facility made available to the astronomical community by the National Optical Astronomy Observatories, which are operated by AURA, Inc., under contract with the US National Science Foundation. STSDAS is distributed by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS 5-26555. It is available at http://iraf.noao.edu/

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... points

These two points, having been calibrated following Lazzati et al. (2001), were also corrected for the zero-point offset described in Sect. 2.1.

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... Hyperz

Available at: http://webast.ast.obs-mip.fr/hyperz/

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...$(V-H)_{\rm AB}$color

For a given frequency $\nu$, the corresponding AB magnitude is defined (see, e.g., Bolzonella et al. 2000b) as $m_{\rm AB} = -2.5$ log  $F(\nu) - 48.60$, where $F(\nu)$ is given in erg s^-1 cm^-2 Hz^-1.

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