TITLE: GCN CIRCULAR NUMBER: 19236 SUBJECT: GRB 160327A: RATIR Optical and NIR Afterglow Detection DATE: 16/03/27 11:52:25 GMT FROM: V. Zach Golkhou at ASU/RATIR V. Zach Golkhou (ASU), 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), 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), Harvey Moseley (GSFC), John Capone (UMD), and Vicki Toy (UMD) report: We observed the field of GRB 160327A (Racusin, et al., GCN 19235) 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 27.39 to 2016/03 27.41 UTC (3.6 minutes to 0.58 hours 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. For a source within the Swift-XRT error circle, in comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following detections: r 21.78 +/- 0.13 i 19.68 +/- 0.02 Z 18.55 +/- 0.02 Y 17.75 +/- 0.01 J 17.56 +/- 0.01 H 16.74 +/- 0.01 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The source is located at RA, Dec = 9:46:48.54, +54:0:46.4 (J2000, +/-0.5"). Further observations are planned. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.