TITLE: GCN CIRCULAR NUMBER: 9326 SUBJECT: GRB 090509: GROND afterglow candidate DATE: 09/05/09 06:00:25 GMT FROM: Thomas Kruehler at MPE/MPI F. Olivares, J. Greiner, T. Kruehler (all MPE Garching) and S. Klose (TLS) report on behalf of the GROND team: We observed the field of GRB 090509 (Swift trigger 351525; Grupe et al., GCN #9325) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m ESO/MPI telescope at La Silla Observatory (Chile). We detect a bright uncatalogued source in all bands at 16:05:39.01 -28:23:59.7 with a magnitude of r' = 17.9 at 15 min after the burst, calibrated using the GROND zeropoint.