TITLE: GCN CIRCULAR NUMBER: 15347 SUBJECT: GRB 131014A: GROND observations DATE: 13/10/17 07:11:16 GMT FROM: Alexander Kann at TLS Tautenburg D. A. Kann (MPE Garching), T. Kruehler (ESO), K. Varela and J. Greiner (both MPE Garching) report on behalf of the GROND team: We observed the field of the Fermi GBM/LAT GRB 131014A (Fitzpatrick & Xiong, GCN #15332) 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 07:07 UT on 16 October 2013, 2.08 days after the GRB. They were performed at an average seeing of 1".0 and at an average airmass of 1.1. Observations were slightly affected by passing clouds. We obtained a total exposure of 4500 sec in g'r'i'z' and 3600 sec in JHK. We detect several sources in and near the refined XRT error circle by Evans & Amral-Rogers (GCN #15339). Source 1 is the one reported by Schulze et al. (GCN #15337), also detected by Troja et al. (GCN #15340) and claimed to be fading by Troja et al. (GCN #15346). We estimate preliminary magnitudes and upper limits (all in the AB system) in an aperture of 1".8: g' = 24.1 ± 0.2 mag r' = 22.8 ± 0.1 mag, i' = 22.5 ± 0.1 mag, z' = 22.2 ± 0.1 mag, J > 21.5 mag, H > 21.0 mag, K > 19.4 mag This source lies significantly outside the refined XRT error circle (Evans & Amral-Rogers, GCN #15339), is extended in our images and we find no evidence of fading as compared to the earlier (t = 1 day) measurement of Schulze et al. (GCN #15337), also using image subtraction versus the NOT image. We thus do not consider it the afterglow of GRB 131014A. The colors and the apparent extent of the source are consistent with a low-redshift galaxy. Source 2 is consistent with being point-like in our images and found at: RA (J2000) = 06:41:12.41 Dec. (J2000) = -19:05:53.5 We estimate preliminary magnitudes and upper limits (all in AB) for a point source of: g' > 25.0 mag r' = 24.8 ± 0.3 mag, i' = 23.8 ± 0.2 mag, z' = 22.8 ± 0.1 mag, J = 21.7 ± 0.2 mag, H = 21.6 ± 0.4 mag, K > 19.8 mag This source is extremely red and lies on the edge of the refined XRT error circle. Source 3 also lies on the edge of the error circle at RA (J2000) = 06:41:12.56 Dec. (J2000) = -19:05:50.1 We estimate preliminary magnitudes and upper limits (all in AB) for a point source of: g' = 25.1 ± 0.4 mag r' = 24.5 ± 0.2 mag, i' = 24.1 ± 0.2 mag, z' = 23.8 ± 0.3 mag, J > 22.0 mag, H > 21.5 mag, K > 19.8 mag, At present, no statement about variability for either source 2 or 3 can be made. Magnitudes are calibrated against SDSS (griz) and 2MASS (JHK) stars, and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.26 mag in the direction of the burst (Schlegel et al. 1998).