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The instrument comprises fiber fed integrated optics beam combination, high resolution spectroscopy, built-in beam analysis and control, near-infrared wavefront sensing, phase-tracking, dual-beam operation, and laser metrology. GRAVITY opens up to optical\/infrared interferometry the techniques of phase referenced imaging and narrow angle astrometry, in many aspects following the concepts of radio interferometry. This article gives an overview of GRAVITY and reports on the performance and the first astronomical observations during commissioning in 2015\/16. We demonstrate phase-tracking on stars as faint as<jats:italic>m<\/jats:italic><jats:sub><jats:italic>K<\/jats:italic><\/jats:sub>\u2248 10\u2009mag, phase-referenced interferometry of objects fainter than<jats:italic>m<\/jats:italic><jats:sub><jats:italic>K<\/jats:italic><\/jats:sub>\u2248 15\u2009mag with a limiting magnitude of<jats:italic>m<\/jats:italic><jats:sub><jats:italic>K<\/jats:italic><\/jats:sub>\u2248 17\u2009mag, minute long coherent integrations, a visibility accuracy of better than 0.25%, and spectro-differential phase and closure phase accuracy better than 0.5\u00b0, corresponding to a differential astrometric precision of better than ten\u2009microarcseconds (<jats:italic>\u03bc<\/jats:italic>as). The dual-beam astrometry, measuring the phase difference of two objects with laser metrology, is still under commissioning. First observations show residuals as low as 50<jats:italic>\u03bc<\/jats:italic>as when following objects over several months. We illustrate the instrument performance with the observations of archetypical objects for the different instrument modes. Examples include the \u2009Galactic center supermassive black hole and its fast orbiting star S2 for phase referenced dual-beam observations and infrared wavefront sensing, the high mass X-ray binary BP\u2009Cru and the active galactic nucleus of PDS\u2009456 for a few<jats:italic>\u03bc<\/jats:italic>as spectro-differential astrometry, the T\u2009Tauri star S\u2009CrA for a spectro-differential visibility analysis,<jats:italic>\u03be<\/jats:italic>\u2009Tel and 24\u2009Cap for high accuracy visibility observations, and<jats:italic>\u03b7<\/jats:italic>Car for interferometric imaging with GRAVITY.<\/jats:p>","DOI":"10.1051\/0004-6361\/201730838","type":"journal-article","created":{"date-parts":[[2017,5,23]],"date-time":"2017-05-23T19:51:46Z","timestamp":1495569106000},"page":"A94","source":"Crossref","is-referenced-by-count":480,"title":["First light for GRAVITY: Phase referencing optical interferometry for the Very Large Telescope Interferometer"],"prefix":"10.1051","volume":"602","author":[{"name":"GRAVITY Collaboration","sequence":"first","affiliation":[]},{"given":"R.","family":"Abuter","sequence":"additional","affiliation":[]},{"given":"M.","family":"Accardo","sequence":"additional","affiliation":[]},{"given":"A.","family":"Amorim","sequence":"additional","affiliation":[]},{"given":"N.","family":"Anugu","sequence":"additional","affiliation":[]},{"given":"G.","family":"\u00c1vila","sequence":"additional","affiliation":[]},{"given":"N.","family":"Azouaoui","sequence":"additional","affiliation":[]},{"given":"M.","family":"Benisty","sequence":"additional","affiliation":[]},{"given":"J. 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