SRG X-ray orbital observatory - Its telescopes and first scientific results R. Sunyaev, V. Arefiev, V. Babyshkin, A. Bogomolov, K. Borisov, M. Buntov, H. Brunner, R. Burenin, E. Churazov, D. Coutinho et al. (32 more) A&A, 656 (2021) A132 Published online: 15 December 2021 DOI: 10.1051/0004-6361/202141179