TITLE: GCN CIRCULAR NUMBER: 16246 SUBJECT: GRB 140508A: Continued RATIR Optical and NIR Observations DATE: 14/05/12 16:15:45 GMT FROM: Nat Butler at UC berkeley 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 10.31 to 2014/05 10.48 UTC (52.29 to 56.42 hours after the BAT trigger), obtaining a total of 2.49 hours exposure in the r and i bands and 1.04 hours exposure in the Z, Y, J, and H bands and again from 2014/05 11.23 to 2014/05 11.48 UTC (74.56 to 80.45 hours after the BAT trigger), obtaining a total of 3.91 hours exposure in the r and i bands and 1.64 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: t+54.4 hrs t+77.5 hrs r 20.63 +/- 0.03 21.25 +/- 0.05 i 20.47 +/- 0.03 21.08 +/- 0.05 Z 20.29 +/- 0.05 21.04 +/- 0.08 Y 20.24 +/- 0.07 20.76 +/- 0.10 J 20.17 +/- 0.06 20.79 +/- 0.11 H 19.92 +/- 0.08 20.58 +/- 0.13 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. Including our initial set of observations (Butler, et al., GCN 16236), the source appears to have faded as t^(-1.5) in all bands. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.