Boissay-Malaquin, RozennHayashi, TakayukiTamura, KeisukeOkajima, TakashiSato,  ToshikiOlsen,  LawrenceKoenecke,  RichardLara, WilsonBleier,  LeorEckart, MeganLeutenegger, MauriceYaqoob,  TahirChiao, Meng2022-10-132022-10-132022-08-31Rozenn Boissay-Malaquin, Takayuki Hayashi, Keisuke Tamura, Takashi Okajima, Toshiki Sato, Lawrence Olsen, Richard Koenecke, Wilson Lara, Leor Bleier, Megan Eckart, Maurice Leutenegger, Tahir Yaqoob, and Meng Chiao "Ground calibration of the x-ray mirror assembly for the x-ray imaging and spectroscopy mission (XRISM) I-measurement setup and effective area", Proc. SPIE 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray, 121811U (31 August 2022); https://doi.org/10.1117/12.2627563https://doi.org/10.1117/12.2627563http://hdl.handle.net/11603/26169SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, CanadaWe present a summary of the ground calibration of the X-ray Mirror Assemblies (XMAs) for the XRISM satellite, that has been performed at the X-ray beamline at NASA’s Goddard Space Flight Center. We used a scan method with a narrow X-ray pencil beam to calibrate both Resolve and Xtend XMAs, at eight different energies. In this paper, we give an overview of the measurement setup, and show the resulting on-axis and off-axis effective area response. Results of imaging performance, stray light, and performance variation across the aperture will be presented in separate publications.14 pagesen-USThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.Public Domain Mark 1.0Text