TITLE: GCN CIRCULAR NUMBER: 17898 SUBJECT: GRB 150527A: Continued RATIR Observations DATE: 15/06/02 14:25:00 GMT FROM: Nat Butler at Az State U 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 150527A (Evans, et al., GCN 17874) 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 initially from 2015/05 27.29 to 2015/05 27.45 UTC (0.17 to 4.06 hours after the BAT trigger), obtaining a total of 3.10 hours exposure in the r, i, and z bands and then again from 2015/05 28.25 to 2015/05 28.47 UTC (23.27 to 28.36 hours after the BAT trigger), obtaining a total of 3.91 hours exposure in the r, i, and z bands. The source we initially detected (Butler, et al., GCN 17876; RA, Dec = 19:15:50.27, 4:12:4.7; J2000, +/-0.5") in the Swift-XRT error circle (Evans, et al., GCN 17874) has not faded in our extended dataset and is, therefore, unlikely to be the afterglow. We note the REM source (Nicastro, et al., GCN 17881) is marginally detected in our first epoch observation with i=23.4 +/- 0.5, calibrated relative to the USNO-B1 catalog. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.