TITLE: GCN CIRCULAR NUMBER: 9178 SUBJECT: GRB 090418B: GROND observations DATE: 09/04/20 22:22:31 GMT FROM: Jochen Greiner at MPI P. Afonso (MPE), S. Klose (Tautenburg), T. Kruehler and J. Greiner (both MPE Garching), report on behalf of the GROND team: GROND (Greiner et al. 2008, PASP 120, 405), mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile) started follow-up observations of GRB 090418B (Copete et al., GCN #9150) on April 19, at 03:00 UTC (18.0 h after the burst). In addition, a second epoch of imaging was obtained, which started on April 20, 04:05 UTC. Similar to Guidorzi et al. (2009, GCN #9176) we do not detect any new object with respect to SDSS/2MASS inside the BAT error circle. Image subtraction between the two epochs does not reveal any obvious variable source. Upper limits from the first observation are as follows (all in the AB system): g' > 23.8 mag r' > 24.0 mag i' > 23.2 mag z' > 23.0 mag J > 22.0 mag H > 21.4 mag K > 20.8 mag Quoted upper limits have been derived using SDSS and 2MASS field stars as reference.