TITLE: GCN CIRCULAR NUMBER: 17089 SUBJECT: GRB 141121A: AAO optical observations DATE: 14/11/23 13:36:48 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), R. Inasaridze (AAO), A. Volnova (IKI), Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 141121A (Lien et al., GCN 17075) with AS-32 (0.7m) telescope of Abastumani Observatory. Observations were performed under mean seeing (FWHM) of 3.5". We obtained several unfiltered images on Nov. 21 starting on (UT) 20:01:35. Within enhanced XRT position (Evans et al., GCN 17080) we clearly detected afterglow of GRB 141109A (Tanga et al., GCN 17078; Perley et al., GCN 17081). Preliminary photometry is following: date UT start t-T0 Filter Exp. OT OT_err (mid, days) (s) 2014-11-21 20:01:35 0.73241 clear 54*120 20.08 0.05 The photometry is based on several SDSS-DR9 stars R magnitudes transformed from SDSS-DR9 based on Lupton transformations: SDSS_id R(Lupton) J081028,70+221318,9 16,317 J081049,68+221012,2 17,148 J081048,76+220822,7 14,413 J081106,66+221346,9 14,626