TITLE: GCN CIRCULAR NUMBER: 16601 SUBJECT: GRB 140716A: GROND afterglow candidate DATE: 14/07/17 12:21:55 GMT FROM: Sebastian Schmidl at TLS Tautenburg F. Knust, J. Bolmer (both MPE Garching), S. Schmidl (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 140716A (Swift trigger 604792; Cummings et al., GCN 16596) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 10:16 UT on July 17, 2014, 23.8 hrs after the GRB trigger. They were performed at an average seeing of 1.8" and at an average airmass of 2.3. We find a faint source inside the XRT error circle given in Page et al. (GCN 16600) at coordinates RA (J2000.0) = 07:12:41.20 DEC (J2000.0) = -60:10:35.3 with an uncertainty of 0.5" in each coordinate. Based on a total exposures of 264 seconds in g'r'i'z' and 240 seconds in JHK, at a mid-time of 23.9 hrs after the burst, we measure the following preliminary magnitudes (all in AB): g' = 21.5 +/- 0.1, r' = 21.0 +/- 0.1, i' = 20.9 +/- 0.1, z' = 20.6 +/- 0.1, J > 20.1, H > 19.6 and K > 18.7. At present we cannot decide if the source is fading. Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.13 mag in the direction of the burst (Schlegel et al. 1998).