{
  "bibcode": "2009GCN..8778....1S",
  "body": "T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC),  \nT. Okajima (JHU/GSFC), T. N. Ukwatta (GWU/GSFC), Y. Urata (Saitama U),  \nC. Wallace (FGCU) \n  \nWe observed the field of GRB 090102 detected by Swift (trigger #338895;  \nMangano et al., GCN #8762) with the 14-inch Goddard Robotic Telescope (GRT)  \nlocated at the Goddard Geophysical and Astronomical Observatory  \n(http://cddisa.gsfc.nasa.gov/ggao/).   \n \nTen set of 5 sec and five set of 10 sec and 30 sec exposures were taken in  \nthe R filter starting from Jan. 2 03:11:58 (UT) about 16.2 min after  \nthe trigger.  We do not detect the optical afterglow (Klotz et al.,  \nGCN #8761, Mangano et al., GCN #8762) both in the individual  \nimages and the combined image.  The estimated three sigma upper limit  \nof the combined image (total exposure of 250 sec) is ~17.9 mag using \nthe USNO-B1 catalog.",
  "circularId": 8778,
  "createdOn": 1231089221000,
  "email": "takanori.sakamoto-1@nasa.gov",
  "subject": "GRB 090102: GRT Optical Observation",
  "submitter": "Takanori Sakamoto at NASA/GSFC  <takanori.sakamoto-1@nasa.gov>",
  "eventId": "GRB 090102"
}