TITLE: GCN CIRCULAR NUMBER: 12174 SUBJECT: GRB 110715A optical observations DATE: 11/07/19 12:16:46 GMT FROM: AAVSO GRB Network at AAVSO Peter Nelson (Ellinbank, Victoria, Australia) reported to the AAVSO International High Energy Network the following optical observations of GRB 110715A (Sonbas et al., GCN #12158): P. Nelson (Ellinbank Observatory, Ellinbank, VIC, Australia) reports a detection of GRB 110715A from fifteen frames of 30-seconds exposure each taken with a clear filter through a 0.32-cm PlaneWave f/8 CDK and SBIG ST8XE camera. The magnitude derived from all frames is m(CR) = 18.0 +/- 0.2 at the mid-point exposure time of 2011 July 15 14:05:01 UT. Magnitudes were measured relative to the USNO-B1.0 comparison star at RA: 15:50:41.62, Decl: -46:14:25.91 with magnitude R=15.21 (see Piranomonte et al., GCN #12164). Nelson reports that time-series was obtained by averaging the 15 frames into three consecutive groups of five frames, yielding the following magnitudes: Time (UT) Mag (Clear, R zeropoint) 13:54:23 18.01 +/- 0.18 14:05:28 17.93 +/- 0.15 14:15:12 18.47 +/- 0.25 The position derived from these images is RA: 15:50:44.07, Decl: -46:14:06.5, which is fully consistent with the optical position given by Kuin et al. (GCN #12162). The AAVSO International High Energy Network was made possible through grants from the Charles Curry Foundation and from NASA.