TITLE: GCN CIRCULAR NUMBER: 16252 SUBJECT: GRB 140428A: GROND afterglow confirmation DATE: 14/05/12 21:05:18 GMT FROM: Karla Varela at MPE K. Varela, C. Delvaux, and J. Greiner (all MPE Garching) report on behalf of the GROND team: We re-observed the field of GRB 140428A (Swift trigger 597519; Kocevski et al., GCN #16177) 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 La Silla Observatory (Chile). A second epoch obtained on May 6th at 02:01 UT, about 7 days after the trigger, shows that the source reported by Knust et al. (GCN # 16191) has clearly faded. We find z' > 23.3, suggesting that the source has faded by at least 1.9 mag, and confirming that this was the afterglow of GRB 140428A.