TITLE: GCN CIRCULAR NUMBER: 16991 SUBJECT: GRB 141028A: Continued RATIR Observations DATE: 14/10/30 16:13:49 GMT FROM: Eleonora Troja at GSFC Eleonora Troja (GSFC), 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 (ORAU/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 141028A (Bissaldi, et al., GCN 16969) 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 2014/10 30.08 to 2014/10 30.31 UTC (39.07 to 44.46 hours after the GBM trigger), obtaining a total of 4.24 hours exposure in the r, i, and z bands. For a source within the enhanced XRT error circle (Pagani et al., GCN 16986), in comparison with the SDSS DR9, we obtain the following detections: r 21.19 ± 0.04 i 20.79 ± 0.03 z 20.74 ± 0.24 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. A comparison to our previous observations (Troja et al., GCN 16980) shows that the afterglow faded with a power-law decay index of alpha ~ 0.9 in all three filters, consistent with the decay reported by Cenko & Perley (GCN 16989). Further observations are planned. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.