{
  "bibcode": "2012GCN.12894....1S",
  "body": "T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC),\nT. Okajima (GSFC), Y. Urata (NCU)\n\nWe observed the field of GRB 120119A detected by Swift\n(trigger #512035; Beardmore et al., GCN Circ. 12859) with the 14-inch\nGoddard Robotic Telescope (GRT) located at the Goddard Geophysical\nand Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/).\n\nA total 294 images of 5 sec (200 images), 30 sec (60 images) and \n60 sec (34 images) exposures were taken in the R filter starting \nfrom January 19 04:06:42 (UT), about 132 seconds after the trigger \n(114 seconds after the BAT position notice), and stopped on \nJanuary 19 06:07:50 (UT).  \n\nWe detect the optical afterglow inside the XRT error circle (Beardmore \net al., GCN Circ. 12876) in the stacked image of good quality 5 sec \nexposure images (total exposure of 985 sec).  The estimated magnitude is \nR = 17.24 +- 0.19 mag (start time: 04:06:42, stop time: 04:44:37).   We do \nnot detected the afterglow in the stacked images of 30 sec exposure images \n(total exposure of 1560 sec) and 60 sec exposure images (total exposure of \n2040 sec).  The estimated five sigma upper limits of those stacked images \nare ~17.9 mag (start time: 04:44:55, stop time: 05:30:01) and ~18.0 mag \n(start time: 05:30:17, stop time: 06:07:50).  All the reported magnitudes \nare estimated using the USNO-B1 catalog.",
  "circularId": 12894,
  "createdOn": 1327198571000,
  "email": "takanori.sakamoto-1@nasa.gov",
  "subject": "GRB 120119A: GRT detection of early afterglow",
  "submitter": "Takanori Sakamoto at NASA/GSFC  <takanori.sakamoto-1@nasa.gov>",
  "eventId": "GRB 120119A"
}