The Grism Lens-Amplified Survey from Space (GLASS). I. Survey overview and first data release
T. Treu, K.B. Schmidt, G.B. Brammer, B. Vulcani, X. Wang, M., Brada\v{c}, M. Dijkstra, A. Dressler, A. Fontana, R. Gavazzi, A.L. Henry, A., Hoag, K.H. Huang, T.A. Jones, P.L. Kelly, M.A. Malkan, C. Mason, L., Pentericci, B. Poggianti, M. Stiavelli, M. Trenti, A. von der Linden

TL;DR
The GLASS survey uses Hubble Space Telescope grism spectroscopy to study galaxy clusters at redshifts 0.3-0.7, providing extensive spectroscopic data and redshift catalogs, including new measurements for faint sources and multiple image systems.
Contribution
This paper presents the first data release of the GLASS survey, including a large spectroscopic catalog and software tools, advancing the study of galaxy clusters and gravitational lensing.
Findings
Catalog of 139 emission-line redshifts for extragalactic sources
Identification of three new redshifts of multiple image systems
High-quality spectra enabling detailed cluster and lensing studies
Abstract
We give an overview of the Grism Lens Amplified Survey from Space (GLASS), a large Hubble Space Telescope program aimed at obtaining grism spectroscopy of the fields of ten massive clusters of galaxies at redshift z=0.308-0.686, including the Hubble Frontier Fields (HFF). The Wide Field Camera 3 yields near infrared spectra of the cluster cores, covering the wavelength range 0.81-1.69mum through grisms G102 and G141, while the Advanced Camera for Surveys in parallel mode provides G800L spectra of the infall regions of the clusters. The WFC3 spectra are taken at two almost orthogonal position angles in order to minimize the effects of confusion. After summarizing the scientific drivers of GLASS, we describe the sample selection as well as the observing strategy and data processing pipeline. We then utilize MACSJ0717.5+3745, a HFF cluster and the first one observed by GLASS, to illustrate…
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