TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2366 SUBJECT: GRB030823: optical observations DATE: 03/08/25 19:53:38 GMT FROM: Alexei Pozanenko at IKI, Moscow M.A. Ibrahimov, I.M. Asfandiyarov, B.B. Kahharov (UBAI), A.Pozanenko (IKI), V.Rumyantsev, E.Pavlenko, O. Antoniuk (CrAO), G.Beskin (SAO) report: We have observed the entire SXC error box of GRB030823 (HETE trigger 2818) with different instruments. The observations started at 15:46 UT (6.9h after burst) with 1.5m telescope of Maidanak High-altitude Observatory (UBAI). Two sets of images (##1,2 in a table below) covering entire SXC error box at different epochs were taken with 1.5m telescope. Visual comparison of images at two different epochs reveals no bright variable source. Observations at Crimean Astrophysical Observatory were carried out with AT-64 and K-380 telescopes. Visual comparison of all images with DSS2 reveals no new sources down to limiting magnitude indicated in the table. # Mid. Time Telescope Exposure Limiting (UT) magnitude (R) 1 23.6651 1.5m (UBAI) 300s 19.5 2 23.7805 1.5m (UBAI) 300s 20.5 3 23.7826 AT-64 (CrAO) 7x180s 20.5 4 23.8131 K-380 (CrAO) 6x300s 19.0