TITLE: GCN CIRCULAR NUMBER: 32087 SUBJECT: GRB 220521A: RATIR Optical and NIR Observations DATE: 22/05/22 15:02:40 GMT FROM: Alan M Watson at UNAM Alan M. Watson (UNAM), Nat Butler (ASU), William H. Lee (UNAM), Alexander Kutyrev (GSFC), Eleonora Troja (UTV), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Enrico Ramirez-Ruiz (UCSC), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Harvey Moseley (GSFC), Rosa L. Becerra (UNAM), Simone Dichiara (PSU), and Océlotl López (UNAM) report: We observed the field of GRB 220521A (Dichiara et al., GCN Circ. 32076) with the Reionization and Transients Infrared Camera (RATIR) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2022/05 22.22 to 2022/05 22.47 UTC (6.04 to 12.03 hours after the BAT trigger), obtaining a total of 2.98 hours exposure in the r and i bands and 1.23 hours exposure in the Z, Y, J, and H bands. For a source within the enhanced (Evans et al., GCN Circ. 32081) Swift-XRT error circle, in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following 3-sigma upper limits: r > 23.07 i > 22.77 Z > 21.13 Y > 21.87 J > 21.75 H > 21.30 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. Our non-detection of the NOT afterglow (Malesani & Pursimo, GCN Circ. 32078) is consistent with a temporal power-law index steeper than about -0.5. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.