TITLE: GCN CIRCULAR NUMBER: 19146 SUBJECT: GRB 160303A: Continued RATIR Optical and NIR Observations DATE: 16/03/04 18:38:31 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), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI), 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), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 160303A (Beardmore, et al., GCN 19126) 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 2016/03 4.12 to 2016/03 4.53 UTC (16.00 to 25.72 hours after the BAT trigger), obtaining a total of 5.52 hours exposure in the r and i bands and 2.27 hours exposure in the Z, Y, J, and H bands. The source reported by Butler et al. (GCN 19131) is not detected in our images. In comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following upper limits (3-sigma): r > 23.77 i > 23.88 Z > 22.37 Y > 21.77 J > 21.52 H > 21.45 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. Our upper limits are consistent with the GROND measurements (Graham et al., GCN 19144) and confirm that the source was the afterglow of GRB160303A. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.