TITLE: GCN CIRCULAR NUMBER: 19292 SUBJECT: GRB 160411A: GROND Optical/NIR upper limits DATE: 16/04/11 18:19:10 GMT FROM: Robert Yates at MPE/Swift R Yates, T-W Chen, and J Greiner (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 160411A (Swift trigger 682339; Page et al., GCN #19279) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 09:14 UT on 11-04-2016, 7 hr 45 min after the GRB trigger. They were performed at an average seeing of 1.9" in the r'-band and at an average airmass of 1.8. Based on the first 49 min of total exposures, we do not detect a source within the 4.0" Swift-XRT error circle reported by Perri et al. (GCN #19281) down to (all in the AB system): g' > 23.7 mag, r' > 23.9 mag, i' > 23.1 mag, z' > 22.9 mag, J > 21.3 mag, H > 20.8 mag, and K > 19.9 mag. The given limits are derived based on calibrating the images against GROND zeropoints and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.02 mag in the direction of the burst (Schlafly & Finkbeiner 2011).