TITLE: GCN CIRCULAR NUMBER: 15990 SUBJECT: GRB 140318A: RATIR Optical and NIR Detections DATE: 14/03/18 08:32:11 GMT FROM: Owen Littlejohns at Az State U Owen Littlejohns (ASU), 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), 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 140318A (Cenko, et al., GCN 15986) 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 2014/03 18.15 to 2014/03 18.31 UTC (3.36 to 7.40 hours after the BAT trigger) obtaining a total of 0.99 hours exposure in the r and i bands and 0.60 hours exposure in the Z, Y, J, and H bands. We detect the previously reported optical counterpart (Schulze, et al. GCN 15987). In comparison with the SDSS DR9 and 2MASS, we obtain the following detections: r 21.88 +/- 0.33 i 21.37 +/- 0.18 Z 20.67 +/- 0.20 Y 20.76 +/- 0.29 J 20.60 +/- 0.21 H 20.29 +/- 0.19 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. In comparison to the observations of Schulze, et al. (GCN 15987) the measured r-band magnitude is consistent with a power-law decay with a temporal index alpha = -1.0. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.