TITLE: GCN CIRCULAR NUMBER: 9732 SUBJECT: GRB 090726: GRT Optical Observation DATE: 09/07/29 10:22:47 GMT FROM: Takanori Sakamoto at NASA/GSFC T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC), T. Okajima (JHU/GSFC), T.N. Ukwatta (GWU/GSFC), Y. Urata (NCU), C.A. Wallace (FGCU) We observed the field of GRB 090726 detected by Swift (trigger #358422; Page et al., GCN Circ. 9706) with the 14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/). 89 set of 30 sec exposures were taken in the R filter starting from July 27 02:31:44 (UT) about 3.75 hours after the trigger and stopped on July 27 03:22:10 (UT). We do not detect the optical afterglow (Moskvitin et al., GCN Circ. 9709; Fatkhullin et al., GCN Circ. 9712; Polasek et al., GCN Circ. 9714; Maticic et al., GCN Circ. 9715; Landsman et al., GCN Circ. 9717) both in the individual images and the combined image. The estimated three sigma upper limit of the combined image (total exposure of 2670.0 sec) is ~18.9 mag using the USNO-B1 catalog.