TITLE: GCN CIRCULAR NUMBER: 14880 SUBJECT: GRB 130612A: RATIR Optical Observations DATE: 13/06/12 05:11:03 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 130612A (Racusin, et al., GCN Circular 14874) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2013/06 12.16 to 2013/06 12.20 UTC (0.40 to 1.31 hours after the BAT trigger), obtaining a total of 0.71 hours exposure in the r' and i' bands. For a source within the Swift-XRT error circle, in comparison with USNO-B1 and 2MASS, we obtain the following detections: r' 21.23 ± 0.07 i' 21.05 ± 0.06 These magnitudes are in the AB system and not corrected for Galactic extinction in the direction of the GRB. The position of the source is consistent with the UVOT afterglow position Racusin, et al., GCN Circular 14874). The afterglow appears to have faded considerably since the earlier observations reported by Melandri et al. (GCN Circular 14875), and Jakobsson et al. (GCN Circular 14878). We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.