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Furtak, Madeline A. Marshall, Mario Nonino, Nathan J. Adams, Nimish P. Hathi, Norman A. Grogin, Nor Pirzkal, Qiao Duan, Qiong Li, Rachana Bhatawdekar, Rafael Ortiz III, Rogier A. Windhorst, Rolf A. Jansen, Russell E. Ryan Jr., Seth H. Cohen, Simon P. Driver, Stephen M. Wilkins, Thomas Harvey","submitted_at":"2024-04-16T17:32:27Z","abstract_excerpt":"We present an analysis of rest-frame UV continuum slopes, $\\beta$, using a sample of 1011 galaxies at $6.5<z<13$ from the EPOCHS photometric sample collated from the GTO PEARLS and public ERS/GTO/GO (JADES, CEERS, NGDEEP, GLASS) JWST NIRCam imaging across $178.9~\\mathrm{arcmin}^2$ of unmasked blank sky. We correct our UV slopes for the photometric error coupling bias using $200,000$ power law SEDs for each $\\beta=\\{-1,-1.5,-2,-2.5,-3\\}$ in each field, finding biases as large as $\\Delta\\beta\\simeq-0.55$ for the lowest SNR galaxies in our sample. 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