TITLE: GCN CIRCULAR NUMBER: 18530 SUBJECT: GRB 151029A: LCOGT-FTS afterglow observations DATE: 15/10/29 15:42:47 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy S. Dichiara (U. Ferrara, ICRANet), C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), A. Gomboc (U. Ljubljana) on behalf of a larger collaboration report: The 2-m LCOGT Faulkes Telescope South began observing Swift GRB 151029A (Ukwatta et al. GCN 18522) on October 29, 09:33 UT (1.7 hours after the burst trigger) with SDSS R and I filters. We marginally detect the optical afterglow (Ukwatta et al. GCN 18522; Knust et al. GCN 18523; Tanvir et al. GCN 18524) due to poor sky conditions with the following magnitudes: Mid Time Exposure Filter Magnitude (hours) (s) ------------------------------------------------------- 1.8 5x120 R 20.6 +- 0.4 2.0 5x120 I 21.0 +- 0.5 ------------------------------------------------------- Calibration is done against nearby USNOB-1 star RA(J2000)=02:34:10.069, DEC(J2000)=-35:24:13.54, assuming R2=16.95 mag and I=17.63 mag.