TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2988 SUBJECT: GRB050126: MASTER optical limit for KECK OT DATE: 05/01/26 21:32:19 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A.Krylov, V.Kornilov, G.Borisov, D.Kuvshinov, A.Belinski, M.Kuznetsov, S.Potanin, G.Antipov, E.Gorbovskoy, N.Tyurina Sternberg Astronomical Institute, Moscow 2.8 hours after SWIFT GRB050126 detection (GCN 2984) MASTER robotic telescope (http://observ.pereplet.ru) had imaging the corresponding area of the sky under the bad weather conditions on the evening sky (see GCN Circ 2986). We have about 50 unfiltered images of the error box (30s exposition, 6 square degrees field, 355 mm diameter ) started at 26 Jan 2005 14:49:18 UT (2.8 hours after GRB time). There is no OT at the KECK OT (GCN Circ 2985)position on 3 sigma level. There is no OT inside BAT 8' error box (GCN Circ 2987) on 3 sigma level. In the Table 1 you can see some reduction of images. Table 1 ---------------------------------------------------------------------- Time (UT) OT Limit (close to R) for KECK position Circ 2985 Note ---------------------------------------------------------------------- 14:54:47 >15.0 14:55:37 >15.0 14:56:26 >15.3 15:28:56 >15.6 15 16 06 - 15 28 00 >16.5 Sum of the 8 images 15 14 07 - 15 53 45 ~17.0 Sum of the 42 images ----------------------------------------------------------------------- JPG-images are available at http://observ.pereplet.ru/images/050126/ . The sum 15 16 06 - 15 28 65 (UT) are available at http://observ.pereplet.ru/images/050126/sum_8.jpg . This message may be cited. This work is supported by Moscow Union "OPTICA" and RFFI 04-02-16411. Mailto: lipunov@sai.msu.ru