TITLE: GCN CIRCULAR NUMBER: 10631 SUBJECT: GRB 100418A: VLT optical observations DATE: 10/04/20 09:21:50 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst Daniele Malesani, Eliana Palazzi, and Simone Scaringi report: We obtained an R-band image of the afterglow of GRB 100418A (Marshall et al., GCN 10612; Filgas et al., GCN 10617) with the X-shooter acquisition camera 34.63 hr after the GRB. The afterglow has decayed by 1.11+-0.03 mag since our previous observation taken 8.37 hr after the GRB (Antonelli et al., GCN 10620). We encourage further observations at all wavelengths of this interesting event. We acknowledge support from the ESO staff at Paranal, in particular Alvaro Alvarez, Claudia Cid, and Fernando Selman. [GCN OPS NOTE(20apr10): Per author's request, Scaringi was added to the author list.]