TITLE: GCN CIRCULAR NUMBER: 11252 SUBJECT: GRB100906A: R band observations DATE: 10/09/07 15:55:11 GMT FROM: Janos Kelemen at Konkoly Obs/Hungary J. Kelemen and K. Sarneczky (Konkoly Observatory) Z. Kuli and B. Ujhelyi (Hungarian Astronomical Association) on behalf of the GRB OT observing program at the Konkoly Observatory. On 09 september 2010 02:25:57 UT (45390 s after the burst) we observed the field of GRB 100906A detected by Swift (trigger=433509; Markwardt et al., GCN 11227) with a 60/90 cm Schmidt telescope located at the Mountain Station of the Konkoly Observatory using R filter. The exposure time of the CCD images were 300 s. We clearly detected the fading afterglow at RA(J2000) = 01h 54m 44.12s Dec(J2000) = +55d 37' 49.3" (astrometry with ASTROMETRICA using UCAC3 catalogue.) with an uncertainty of 0.2 arcseconds. Time Mag Error. Flag. [s] [R] [1-sigma] ------------------------------------- 45390 20.6 0.1 - 45709 20.7 0.1 - 46028 21.3 0.1 - ------------------------------------- The above magnitudes have not been corrected for the Galactic extinction.