TITLE: GCN CIRCULAR NUMBER: 19314 SUBJECT: GRB 160412A: GROND upper limits DATE: 16/04/14 09:54:48 GMT FROM: Jan Bolmer at MPE/Garching J. Bolmer, T. Schweyer and J. Greiner (all MPE Garching) report on behalf of the GROND Team: We observed the field of GRB 160412A (Swift trigger 682522; Gibson et al., GCN #19298) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at the ESO La Silla Observatory (Chile). Observations started at 23:11 UT on 2016-04-12, 18.8 h after the GRB trigger. They were performed at an average seeing of 2.5“ and at an average airmass of 2.3. We detect no source within or close to the Swift-XRT error circle reported by Goad et al. (GCN #19299). Based on 36 min of exposure in g'r'i'z' and 37 min in JHK, at a mid-time of 023:35 UT, we derive the following preliminary upper limits (in AB system): g' > 23.5 mag, r' > 23.6 mag, i' > 22.9 mag, z' > 22.7 mag, J > 20.2 mag, H > 29.6 mag, and K_s > 19.7 mag. Given upper limits are calibrated against GROND zeropoints (g'r'i'z') as well as 2MASS field stars (JHK_s). No correction for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.03 mag in the direction of the burst (Schlafly & Finkbeiner 2011) has been applied.