TITLE: GCN CIRCULAR NUMBER: 17092 SUBJECT: GRB 141121A: LCO-FTN rebrightening confirmation DATE: 14/11/24 09:58:43 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy S. Dichiara and C. Guidorzi (U. Ferrara) on behalf of a large collaboration report: The Las Cumbres Observatory 2-m Faulkes Telescope North in Hawaii re-observed Swift GRB 141121A (Lien et al. GCN Circ 17075) on November 23 at 10:43:39 UT, i.e. ~2.29 days after the BAT trigger, with the r' and i' filters. We confirm the rebrightening of the optical afterglow reported by RATIR (Watson et al. GCN 17090) with the following magnitudes: Mid time from Total Exp Filter Magnitude trigger (days) (s) ------------------------------------------------- 2.31 120x10 r' 20.61 +- 0.04 2.29 120x10 i' 20.34 +- 0.05 ------------------------------------------------- Magnitudes are calibrated against nearby SDSS stars. Observations are going on.