TITLE: GCN CIRCULAR NUMBER: 16236 SUBJECT: GRB 140508A: RATIR Optical and NIR Observations DATE: 14/05/09 14:34:57 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 140508A (Yu, et al., GCN 16224) 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 2014/05 9.19 to 2014/05 9.46 UTC (25.61 to 32.04 hours after the BAT trigger), obtaining a total of 4.27 hours exposure in the r and i bands and 1.79 hours exposure in the Z, Y, J, and H bands. For a source positionally coincident with the iPTF optical transient (Singer, et al. , GCN 16226), in comparison with the SDSS DR9 and 2MASS, we obtain the following detections: r 19.65 +/- 0.02 i 19.52 +/- 0.02 Z 19.36 +/- 0.03 Y 19.20 +/- 0.03 J 19.18 +/- 0.03 H 18.98 +/- 0.03 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The source fades in time approximately as t^(-1.5) in all bands during our observation. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.