TITLE: GCN CIRCULAR NUMBER: 32889 SUBJECT: GRB 221028A: CrAO/ZTSh optical upper limit DATE: 22/10/29 20:04:27 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), N. Pankov (HSE), V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of IKI GRB FuN: We observed the GRB 221028A (Lien et al., GCN 32874; Ursi et al., GCN 32885) with ZTSh 2.6m telescope of CrAO observatory starting on Oct. 28 (UT) 19:38:37. We do not detect any optical object within XRT localization (Lien et al., GCN 32874). This is consistent with reported non-detections (Hu et al., GCN 32878; Kumar et al., GCN 32876; Lipunov et al., GCN 32879; Strausbaugh et al., GCN 32881; Niwano et al., GCN 32883; Kumar et al., GCN 32886; Watson et al., GCN 32888). Preliminary photometry of the field in a combined image is following Date UT start t-T0 Filter Exp. OT err UL(3sigma) (mid, days) (s) 2022-10-28 19:38:37 0.27233 R 10*120 n/d n/d 20.7 The photometry is based on several nearby USNO-B1.0 (R2) stars USNO-B1.0 RA DEC R2 20:56:40.7621 +41:04:57.000 15.60 20:56:51.9768 +41:04:22.922 17.21 20:57:00.0629 +41:02:55.072 16.04