TITLE: GCN CIRCULAR NUMBER: 18244 SUBJECT: GRB 150818A: TSHAO and SAO RAS optical observations DATE: 15/09/07 09:29:09 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Moskvitin (SAO RAS), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We are continuing observations the field of Swift GRB 150818A (D'Elia et al., GCNC 18152) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory and Zeiss-1000, 1-m telescope of SAO RAS. The optical transient (Marshall et al. GCN 18155; McCauley et al. GCN 18161; Mazaeva et al. GCN 18175; Sanchez-Ramirez et al. GCN 18177; Mazaeva et al. GCN 18182, GCN 18189, GCN 18205; Schulze et al. GCN 18179) is clearly visible on combined images in each epochs. The updated light curve of Supernova (de Ugarte Postigo et al. GCN 18213; Mazaeva et al. GCN 18205) + host galaxy (Sanchez-Ramirez et al., GCN 18177; de Ugarte Postigo et al. GCN 18213) can be found in http://grb.rssi.ru/GRB150818A/GRB150818A_R_lc.png The evident maximum of SN brightness (in Rc-filter) was on ~ Sep. 1-2, and the brightness of SN+host galaxy was R ~ 21.1 +/- 0.1 on Sep. 6 (UT) 18:00. We are grateful to V.P. Goranskiy for assistance in SAO RAS observations.