TITLE: GCN CIRCULAR NUMBER: 26036 SUBJECT: GRB 191019A: TSHAO optical observations, probable afterglow and host galaxy DATE: 19/10/19 18:55:20 GMT FROM: Alexei Pozanenko at IKI, Moscow I. Reva (FAPHI), A. Pozanenko (IKI), M. Krugov (FAPHI), S. Belkin (IKI), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN: We observed the field of GRB 191019A (Simpson et al. GCN 26031) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on Oct. 19 (UT) 15:26:32, i.e. 14 minutes after GRB trigger. Within XRT error circle (Evans et al., GCN 26034) we found only one source which is presented in catalogs. Preliminary photometry of the source is following. Date UT start t-T0 Filter Exp. OT Err. (mid, days) (s) 2019-10-19 15:26:32 0.013877 R 720 18.37 0.03 The photometry is based nearby USNO-B1.0 stars. The brightness of the catalogued source is R2(USNO-B1.0 340.024514480) = 19.36 and r'(Pan-STARRS 0726-1153339) = 19.30. The source is probably a host galaxy of GRB 191019A and we suggest the afterglow of the source on a top of the host galaxy.