tokens: Acknowledgments We thank the following institutions and agencies for support of this work: Italian Space Agency (ASI, Italy) contract number I/024/12/1, Centre National dtudes Spatiales (CNES, France), DLR (Germany), NASA (USA) Rosetta Program and Science and Technology Facilities Council (UK). The work of UF, LD and partially salary of GR was supported by NASA Rosetta Grant JPL-1270007. VIRTIS was built by a consortium, which includes Italy, France and Germany, under the scientific responsibility of the Istituto di Astrofisica e Planetologia Spaziali of INAF, Italy, which also guides the scientific operations. The VIRTIS instrument development, led by the prime contractor Leonardo-Finmeccanica (Florence, Italy), has been funded and managed by ASI, with contributions from the Observatoire de Meudon financed by CNES, and from DLR. We thank the Rosetta Science Ground Segment and the Rosetta Mission Operations Centre for their support throughout all the phases of the mission. The VIRTIS calibrated data will be available through the ESAs Planetary Science Archive Website ( www.rssd.esa.int/index.php?projectPSApageindex ) and is available upon request until posted to the archive.
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