10.4 m GTC observations of the nearby VHE-detected GRB 190829A/SN 2019oyw Y.-D. Hu, A. J. Castro-Tirado, A. Kumar, R. Gupta, A. F. Valeev, S. B. Pandey, D. A. Kann, A. Castellón, I. Agudo, A. Aryan et al. (8 more) A&A, 646 (2021) A50 Published online: 04 February 2021 DOI: 10.1051/0004-6361/202039349