TITLE: GCN CIRCULAR NUMBER: 15328 SUBJECT: GRB 131011A: GROND afterglow observations DATE: 13/10/13 07:41:49 GMT FROM: Vladimir Sudilovsky at MPE V. Sudilovsky, M. Tanga, and J. Greiner (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 131011A (Kasliwal et al., GCN #15324) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at La Silla Observatory (Chile). Observations started at 03:30 UT on 13 October 2013. They were performed at an average seeing of 1.3" and at and average airmass of 1.2. We find the afterglow candidate reported by Kasliwal et al. Based on the first 1500 sec g'r'i'z' and 1200 sec JHK exposure, we estimate preliminary magnitudes (all in AB) of g' = 21.9 ± 0.1 mag r' = 21.7 ± 0.1 mag, i' = 21.5 ± 0.1 mag, z' = 21.3 ± 0.1 mag, J = 21.1 ± 0.1 mag, H = 20.5 ± 0.2 mag, K = 20.2 ± 0.4 mag, Magnitudes are calibrated against nearby SDSS (griz) and 2MASS (JHK) stars, and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.02 mag in the direction of the burst (Schlegel et al. 1998).