{
  "bibcode": "2012GCN.12816....1S",
  "body": "T. Sakamoto (UMBC/GSFC), D. Donato (UMD/GSFC), N. Gehrels (GSFC),\nT. Okajima (GSFC), Y. Urata (NCU)\n\nWe observed the field of INTEGRAL Weak trigger #6433 with the\n14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical\nand Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/).\n\nA total 242 good quality images of 5 sec (200 images) and 30 sec (42 images) \nexposures were taken in the R filter starting from Jan 6 05:11:52 (UT), \nabout 58 seconds after the trigger (53 seconds after the notice), and \nstopped on Jan 6 06:08:10 (UT).  We do not detect the optical afterglow \nboth in the individual images and the stacked image inside the 3.65 arcmin \nerror circle.  The estimated five sigma upper limit of the combined \nimage (total exposure of 2260 sec) is ~17.4 mag using the USNO-B1 \ncatalog.",
  "circularId": 12816,
  "createdOn": 1325897773000,
  "email": "takanori.sakamoto-1@nasa.gov",
  "subject": "INTEGRAL Weak trigger #6433: GRT Optical Observation",
  "submitter": "Takanori Sakamoto at NASA/GSFC  <takanori.sakamoto-1@nasa.gov>"
}