GCN Circular 10425
T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC), T. Okajima (JHU/GSFC), Y. Urata (NCU), C.A. Wallace (FGCU) We observed the field of GRB 100213A detected by Swift (trigger #412217; Grupe et al., GCN Circ. 10411) with the 14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/). Total 49 images of 60 sec exposures were taken in the R filter starting from February 13 23:42:02 (UT) about 1.2 hours after the trigger and stopped on February 14 01:28:00 (UT). We do not detect the optical afterglow both in the individual images and the combined image inside the XRT position (Beardmore et al., GCN #10418). The estimated three sigma upper limit of the combined image (total exposure of 1800 sec; excluding bad quality images) is ~17.5 mag using the USNO-B1 catalog.