TITLE:   GCN CIRCULAR
NUMBER:  10425
SUBJECT: GRB 100213A: GRT Optical Observation
DATE:    10/02/15 20:29:56 GMT
FROM:    Takanori Sakamoto at NASA/GSFC  <takanori@milkyway.gsfc.nasa.gov>

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.