Treu, T.T.Treu0000-0001-8940-6768Schmidt, K. B.K. B.Schmidt0000-0003-0980-1499Brammer, G. B.G. B.Brammer0000-0001-8751-8360Vulcani, BenedettaBenedettaVulcani0000-0003-3820-2823Wang, X.X.WangBradac, M.M.BradacDijkstra, M.M.DijkstraDressler, A.A.DresslerFONTANA, AdrianoAdrianoFONTANAGavazzi, R.R.GavazziHenry, A. L.A. L.HenryHoag, A.A.HoagHuang, K. -H.K. -H.HuangJones, T. A.T. A.JonesKelly, P. L.P. L.KellyMalkan, M. A.M. A.MalkanMason, C.C.MasonPentericci, L.L.PentericciPOGGIANTI, Bianca MariaBianca MariaPOGGIANTIStiavelli, M.M.StiavelliTrenti, M.M.Trentivon der Linden, A.A.von der Linden2020-05-112020-05-112016http://hdl.handle.net/20.500.12386/24681In this paper we give an overview of Grism Lens Amplified Survey from Space (GLASS; PI Treu; GO 13459) and we present the first release of the data for MACS J0717.5+3745, the first cluster targeted by the survey. Spectra for 1151 galaxies down to magnitude H<SUB>AB</SUB>=24 (F140W) have been visually inspected by members of our team to ensure quality control. <P />GLASS is a cycle-21 large program with the Hubble Space Telescope (HST), targeting 10 massive clusters, including the 6 Frontier Fields, using the WFC3 and ACS grisms. The program consists of 140 primary orbits (with the G102 and G141 grisms; range 0.81-1.69μm) and 140 parallel orbits (with the G800L grism).enDatabasehttps://cdsarc.unistra.fr/viz-bin/ReadMe/J/ApJ/812/114?format=html&tex=true2016yCat..18120114TFIS/05 - ASTRONOMIA E ASTROFISICA