TITLE: GCN CIRCULAR NUMBER: 12428 SUBJECT: GRB 111008A, GROND observations DATE: 11/10/09 06:31:49 GMT FROM: Sylvio Klose at TLS Tautenburg M. Nardini (Milano Bicocca), S. Klose (TLS Tautenburg), J. Greiner (MPE Garching), and P. Afonso (MPE/American River College) report on behalf of the GROND team: We observed the field of GRB 111008A (Saxton et al., GCN #12423) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile). Observations started at 4:30 UT on October 08, 6.3 hours after the GRB trigger. We detect a point source within the 1.7 arcsec enhanced Swift-XRT error circle (Beardmore et al., GCN #12425) at coordinates RA, DEC (J2000) = 04:01:48.25, -32:42:33.2 (+/-0.5"), confirming the observations from Gemini (Levan et al., GCN 12426). Preliminary magnitudes at a meantime of 5:15 UT are (in the AB system): g' > 24.0, r' = 22.6 +/- 0.1, i' = 20.9 +/- 0.1, z' = 19.9 +/- 0.1, indicating a cosmological g-band dropout. Data are calibrated against GROND zeropoints. Observations are ongoing.