{
  "bibcode": "2008GCN..8339....1C",
  "body": "B. E. Cobb (UC Berkeley) reports:\n\nUsing the ANDICAM instrument on the 1.3m telescope at CTIO, we\ncontinued to obtain optical/IR imaging of the error region of GRB 081007\n(GCN 8330, Baumgartner et al.) following GCN 8332.\n\nAt a mid-exposure time of 2008-10-07 06:04 UT (40 minutes post-burst),\nthe GRB afterglow (GCN 8330, Baumgartner et al.) had the following\nmagnitudes:\nB = 19.36 +/- 0.04\nR = 18.37 +/- 0.03\nI = 17.73 +/- 0.03\n\nObservations were obtained under non-photometric conditions.  These\npreliminary magnitudes are calibrated against several USNO-B1.0 stars in\nthe field, so there is likely an additional photometric calibration error\nof ~0.2 magnitudes.\n\nFrom 23 minutes to 112 minutes post-burst the decay rate of the\nafterglow remains at alpha = -0.6 (where afterglow flux is proportional to\nt^alpha) in all our optical colors.\n\nFurther observations of this burst are planned.",
  "circularId": 8339,
  "createdOn": 1223430555000,
  "email": "bcobb@astro.berkeley.edu",
  "subject": "GRB 081007, SMARTS optical afterglow observations",
  "submitter": "Bethany Cobb at Yale U  <bcobb@astro.berkeley.edu>",
  "eventId": "GRB 081007"
}