TITLE: GCN CIRCULAR NUMBER: 12353 SUBJECT: GRB 110915A: GROND Upper limits DATE: 11/09/16 18:32:42 GMT FROM: Alexander Kann at TLS Tautenburg J. Elliott (MPE Garching), D. A. Kann (Tautenburg Obs.), and J. Greiner (also MPE Garching) report on behalf of the GROND team: We observed the field of GRB 110915A (Swift trigger 503219; Holland et al., GCN 12335) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPI/ESO telescope at La Silla Observatory (Chile). Observations started at 23:26 UT on 15 September, 10.1 hours after the GRB trigger. They were performed at an average seeing of 1.1 and at an average airmass of 1.2. We do not detect a source within the enhanced UVOT/Swift-XRT error circle reported by Evans et al. (GCN 12340). For a total exposure time of 6003 s in g'r'i'z' and 4800 s in JHK, we do not detect a source down to: g' > 25.5, r' > 25.4, i' > 24.3, z' > 23.8, J > 21.2, H > 20.0, and K > 18.6 The given limits are derived based on calibrating the images against GROND zeropoints (g'r'i'z' are AB mags) and 2MASS field stars (JHK are Vega mags) and are not corrected for the Galactic foreground extinction corresponding to a reddening of E(B-V) = 0.058 in the direction of the burst (Schlegel et al. 1998). These upper limits are in agreement with the i/z upper limits from Perley et al. (GCN 12346) and the J/Ks upper limits from Berger et al. (GCN 12349). [GCN OPS NOTE(16sep11): Per author's request, the date in the second paragraph was corrected from "16 Sep" to "15 Sep", and Perley citation was changed from "12345" to "12346".]