TITLE: GCN CIRCULAR NUMBER: 21721 SUBJECT: GRB 170827A: REM optical/NIR observations DATE: 17/08/27 09:28:32 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo, D. Fugazza, S. Covino (INAF/OAB) report on behalf of the REM team: We observed the field of the short GRB 170827A (Marshall et al., GCN 21718) with the 60-cm robotic telescope REM located at the La Silla Observatory (Chile). The observations started at 05:14:24 UT, 116 seconds after the burst, and were carried out simultaneously in the g, r, i, z and H bands. A preliminary photometry of the first co-added images indicates that no obvious afterglow candidate is detected within the Swift/XRT error circle (Marshall et al., GCN 21718) down to the following 3sigma limiting AB magnitudes: r > 19.5 at T-T0 = 720s H > 17.5 at T-T0 = 585s Magnitudes are in the AB system and have been calibrated with respect to the 2MASS (H-band) and APASS (r-band) catalogues.