TITLE: GCN CIRCULAR NUMBER: 14334 SUBJECT: GRB 130327A: RATIR Optical and NIR Observations DATE: 13/03/27 04:56:14 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 (UCSC), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), Jos� A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes�s Gonz�lez (UNAM), Carlos Rom�n-Z��iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 130327A (Ukwatta, et al., GCN 14331) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron�mico Nacional on Sierra San Pedro M�rtir from 2013/03 27.12 to 2013/03 27.17 UTC (1.16 to 2.17 hours after the BAT trigger), obtaining a total of 0.82 hours exposures in the r' and i' bands and 0.35 hours of exposure in the Z, Y, J, and H bands. We detect one uncatalogued source within the XRT error region (GCN 14331), at a position RA , DEC: = 92.03875, 55.71504 (+/-0.5 ", J2000). This is 2.7" from the center of the XRT error circle. In comparison with USNO-B1 and 2MASS, we derive the following detections and upper limit (3-sigma) in the AB magnitude system: r' 21.22 +/- 0.10 i' 21.17 +/- 0.09 Z 20.09 +/- 0.14 Y 19.98 +/- 0.17 J 19.98 +/- 0.23 H > 20.08 We also detect a second uncatalogued source just outside the XRT error circle (3.9" from the center) at RA , DEC: 92.03822, 55.71326 (+/-0.5 ", J2000): r' 21.61 +/- 0.14 i' 20.36 +/- 0.05 Z 19.15 +/- 0.06 Y 18.72 +/- 0.06 J 18.70 +/- 0.07 H 18.53 +/- 0.09 We note that this second source has a brightness consistent with the earlier PAIRITEL measurement (Morgan; GCN 14333). We thank the staff of the Observatorio Astron�mico Nacional in San Pedro M�rtir. Further observations are planned.