TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2543 SUBJECT: MASTER: RXTE GRB040308 optical observation DATE: 04/03/10 23:58:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A. Krylov, V. Kornilov, G. Borisov, D. Kuvshinov, A. Belinski, I. Chilingarian, M. Kuznetsov, S. Potanin, G. Antipov Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow report: We have observed the 6 sq. degrees field around RXTE-ASM GRB040308 with MASTER system (355 mm, http://observ.pereplet.ru) equipped with AP16E 4k by 4k CCD. We obtained 50 unfiltered images with 30s exposure for each. No afterglow candidate has been found compared to DSS2 within circular error box 8 arcmin in diameter. Exposures were taken between 18:40 Mar 10 and 20:00 Mar 10 (48 hours after the burst). The estimated limiting magnitude (S/N=3) is 21.2 . Preview image of the whole frame in the jpeg format is available at (center of the error box is signed with a cross) http://observ.pereplet.ru/images/GRB040308.jpg Reduced FITS images are available by request. This message is citable.