TITLE: GCN CIRCULAR NUMBER: 16121 SUBJECT: GRB 140419A: RATIR Optical and NIR Observations DATE: 14/04/19 05:30:28 GMT FROM: Nat Butler at Az State U 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), 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 140419A (Marshall, et al., GCN 16118) 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 2014/04 19.18 to 2014/04 19.20 UTC (9 to 40 minutes after the BAT trigger), obtaining a total of 0.36 hours exposure in the r and i bands and 0.15 hours exposure in the Z, Y, J, and H bands. We detect the UVOT optical transient (see also, Zheng, et al., GCN 16116; Guver et al., GCN 16120). In comparison with the SDSS DR9 and 2MASS, we obtain the following detections: r 16.22 +/- 0.01 i 15.81 +/- 0.01 Z 15.66 +/- 0.01 Y 15.46 +/- 0.02 J 15.31 +/- 0.01 H 15.26 +/- 0.02 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The source appears to be fading approximately as t^(-1) in all of our bands during the observation. Further observations are ongoing. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.