TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2158 SUBJECT: MASTER:optical observations GRB030418 DATE: 03/04/21 00:11:07 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A. Krylov, V. Kornilov, G. Borisov, A. Belinski, I. Chilingarian, D. Kuvshinov, M.V. Kuznetsov, S. Potanin, V. Vitrischak Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow report: The error box of GRB030418 (HETE 2679) was observed with MASTER system (280mm, http://observ.pereplet.ru). We obtained 20 measurements in R filter. Our observations started at Apr 18, 21:00 UT (11 hours after the GRB) and had been lasting for 2.5 hours up to Apr 18 22:36 UT (12,5 hours after the GRB). There is no OT brighter than 16.5 (R-band) in error box. Transparency was quite poor due to low altitude of the field above the horizont. Our fits-images are available at: http://observ.pereplet.ru/images/GRB030418/30S9.zip This message may be cited.