{
  "bibcode": "2009GCN.10219....1H",
  "body": "J. Haislip, D. Reichart, K. Ivarsen, A. LaCluyze, L. Cominsky, K. McLin, T. \nGraves, G. Spear, R. Egger, A. Foster, J. Moore,\nA. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander \nreport:\n\nSkynet observed the Swift/BAT localization of GRB 091018 (Troja et al., GCN \n10191) with five of the 16\" PROMPT telescopes at\nCTIO beginning 61.6 minutes after the trigger in BVRI.\n\nSkynet continued observing with the 14\" GORT telescope at Hume Observatory \nin California beginning 27.8 hours after the\ntrigger in RI.\n\nWe detect the afterglow (Smith et al., GCN 10192) in all filters.\n\nSimilar to GRB 091018 (LaCluyze et al., GCN 10046), the afterglow faded \nmore slowly in the red bands than in the blue bands\nover the course of the first night.\n\nBetween 1 and 4 hours after the trigger, the afterglow faded with a \npower-law index of about -0.4 in I and about -0.5 in B.\nBetween 4 and 9 hours after the trigger, the afterglow faded with a \npower-law index of about -0.9 in I and about -1.1 in B.\nOverall, I - B brightened by about 0.25 mag over the course of 8 hours.\n\nBetween 9 and 33 hours after the trigger, the afterglow faded with a \npower-law index of about -1.2 in all bands.\n\nAt 32.2 hours after the trigger, the afterglow's magnitude was R = 19.39 \n+/- 0.06 (statistical) +/- 0.37 (systematic;\ncalibrated to 102 USNO B1 stars).\n\nSkynet's most recent BVRI light curve, calibrated to USNO B1 and NOMAD \nstars, can be found here:\n\nhttp://skynet.unc.edu/grb/grb091127.png",
  "circularId": 10219,
  "createdOn": 1259638122000,
  "email": "haislip@physics.unc.edu",
  "subject": "GRB 091127: Skynet/PROMPT Observations of Fading",
  "submitter": "Josh Haislip at U.North Carolina  <haislip@physics.unc.edu>",
  "eventId": "GRB 091127"
}