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Fulton, M. E. Huber, M. Nicholl, P. McGill, Q. Wang, R. J. Foley, R. Ridden-Harper, R. Wainscoat, S. A. Sim, S. J. Smartt, S. K. Yadavalli, S. Srivastav, S. Yang, T. de Boer, T. Lowe, T. Moore, T.-W. Chen, V. Ramakrishnan, Y.-C. Pan, Y. Zenati","submitted_at":"2023-01-25T13:32:08Z","abstract_excerpt":"We present extensive optical photometry of the afterglow of GRB~221009A. Our data cover $0.9 - 59.9$\\,days from the time of \\textit{Swift} and \\textit{Fermi} GRB detections. Photometry in $rizy$-band filters was collected primarily with Pan-STARRS and supplemented by multiple 1- to 4-meter imaging facilities. We analyzed the Swift X-ray data of the afterglow and found a single decline rate power-law $f(t) \\propto t^{-1.556\\pm0.002}$ best describes the light curve. 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