TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5619 SUBJECT: GRB 060926: MASTER OT alert observation DATE: 06/09/26 21:14:12 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, A.Belinski, E.Gorbovskoy, A.Krylov, G.Borisov, A.Sankovich, V.Vladimirov, P.Gritsyk Sternberg Astronomical Institute, Moscow Union 'Optic' MASTER robotic system (http://observ.pereplet.ru) responded to GRB060926 (Holland et al., GCN Circ 5612). The first image was started at 2006-09-26 16:49:57 UT, 76 s after the GRB time. The unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B). We see OT (Holland et al., GCN Circ 5612). Our results: T-T_grb exp_time m (close to R) S/N 76 s - 106 s 30 s >17 5 76 s - 360 s 5x30 s 18+-0.3 76 s - 820 s 10x30 s 18.5+-0.3 Reduction is continued. Images are available: http://pereplet.sai.msu.ru/nauka/i12.jpg http://pereplet.sai.msu.ru/nauka/i12a.jpg http://pereplet.sai.msu.ru/nauka/i12b.jpg Small part with OT http://observ.pereplet.ru/images/GRB060926/GRB060926_5.jpg http://observ.pereplet.ru/images/GRB060926/GRB060926_10.jpg This work is supported by RFFI 04-02-16411 grant. This message can be cited. Mailto: lipunov@sai.msu.ru