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Polishook, D. Schiminovich, D. Steeghs, D. Xu, E. C. Bellm, E. Kammoun, E. O. Ofek, E. Segre, F. Cuadra, G. Corcoran, G. K. Keating, G. Mo, G. P. Srinivasaragavan, G. Pugliese, G. Ramsay, G. Schroeder, G. S. H. Paek, G. Waratkar, I. Andreoni, J. C. Jaimes, J. C. Vel'azquez, J. H. Gillanders, J. L. Wise, J. Lyman, J. Purdum, J. Rastinejad, J. Sollerman, K. Ackley, K. C. Chambers, K. De, K. Noysena, K. -R. Hinds, K. Ulaczyk, K. W. Smith, L. Cotter, L. K. Nuttall, M. A. Gurwell, M. Bremer, M. E. Huber, M. F. Aller, M. J. Dyer, M. Kasliwal, M. Nicholl, M. Pursiainen, M. Shrestha, M. W. Coughlin, N. Sarin, N. Sravan, P. Jakobsson, P. Minguez, P. O'Brien, P. Rekhi, P. V. de la Parra, R. A. Perley, R. Jayaraman, R. Konno, R. Kotak, R. P. Breton, R. Rao, R. Riddle, R. R. Laher, R. Stein, R. Wainscoat, S. B. Cenko, S. Belkin, S. Ben-Ami, S. Garrappa, S. Ibrahim, S. J. Smartt, S. Rose, S. Srivastav, S. Yang, T. Ahumada, T. de Boer, T. Killestein, T. Surti, T. -W. Chen, V. D'Elia, V. S. Dhillon, X. J. Hall, Y. M. Shani, Y. Wagh, Z. McGrath","submitted_at":"2026-06-03T17:51:05Z","abstract_excerpt":"The origins of sub-luminous ($L_\\mathrm{\\gamma,\\mathrm{iso}} < 10^{49.5}$\\,erg\\,s$^{-1}$) gamma-ray bursts (GRBs) associated with broad-lined Type~Ic supernovae (Ic-BL SNe) are poorly understood, in part due to the low discovery rate and faint afterglows. Here we present the identification of the optical afterglow of Fermi-GBM-detected GRB\\,260310A (AT\\,2026fgk) as a rapidly rising ($>1\\,$mag\\,d$^{-1}$), red ($g-r=0.4$\\,mag) transient using the Gravitational-wave Optical Transient Observatory, Large Array Survey Telescope, and Zwicky Transient Facility (ZTF) data streams. 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Aryan, A. Bochenek, A. C. Readhead, A. Krassilchtchikov, A. Kraus, A. Kumar, A. Levan, A. Martin-Carrillo, A. Nugent, A. R. Escorial, A. Ruiz Del Pozo, A. Sasli, A. Y. Q. Ho, B. P. Gompertz, B. Rusholme, C. Fremling, C. Sevilla, C. T. Christy, D. A. Perley, Dimple, D. K. Galloway, D. Kovaleva, D. O'Neill, D. Polishook, D. Schiminovich, D. Steeghs, D. Xu, E. C. Bellm, E. Kammoun, E. O. Ofek, E. Segre, F. Cuadra, G. Corcoran, G. K. Keating, G. Mo, G. P. Srinivasaragavan, G. Pugliese, G. Ramsay, G. Schroeder, G. S. H. Paek, G. Waratkar, I. Andreoni, J. C. Jaimes, J. C. Vel'azquez, J. H. Gillanders, J. L. Wise, J. Lyman, J. Purdum, J. Rastinejad, J. Sollerman, K. Ackley, K. C. Chambers, K. De, K. Noysena, K. -R. Hinds, K. Ulaczyk, K. W. Smith, L. Cotter, L. K. Nuttall, M. A. Gurwell, M. Bremer, M. E. Huber, M. F. Aller, M. J. Dyer, M. Kasliwal, M. Nicholl, M. Pursiainen, M. Shrestha, M. W. Coughlin, N. Sarin, N. Sravan, P. Jakobsson, P. Minguez, P. O'Brien, P. Rekhi, P. V. de la Parra, R. 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