{
  "bibcode": "2009GCN..9999....1H",
  "body": "J. Haislip, D. Reichart, K. Ivarsen, L. Cominsky, K. McLin, T. Graves, G. \nSpear, A. LaCluyze, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, \nA. Trotter, J. A. Crain, and M. Nysewander report:\n\nSkynet observed the Swift/BAT localization of GRB 090812 (Stamatikos et \nal., GCN 9768) with four of the 16\" PROMPT telescopes at CTIO beginning 3.9 \nminutes after the trigger in UBVRI through variable cloud cover.\n\nSkynet continued observing with the 14\" GORT telescope at Hume Observatory \nin California beginning 48.4 minutes after the the trigger in RI.\n\nWe detect the afterglow (Stamatikos et al., GCN 9768).  Stacking only \nimages that increase the limiting magnitude yields:\n\nmean                                                       1-sig. 1-sig.\ntime                                                       sys.   stat.\nsince                                            cal.      cal.   cal.\ntrig.   tel.     exp.     fil. magnitude         stars*    unc.   unc.\n                  (# x s)                                   (mag)  (mag)\n\n15.0 m  PROMPT-4 2 x 80   R    > 17.7 (3 sig.)   50 SDSS 7 0.008  0.010\n15.0 m  PROMPT-5 2 x 80   I    > 17.0 (3 sig.)   20 SDSS 7 0.026  0.010\n15.0 m  PROMPT-2 2 x 80   V    > 17.4 (3 sig.)   15 SDSS 7 0.030  0.020\n32.1 m  PROMPT-3 2 x 80   B    > 18.5 (3 sig.)   25 SDSS 7 0.028  0.031\n32.6 m  PROMPT-2 4 x 80   V    > 18.3 (3 sig.)   15 SDSS 7 0.039  0.010\n                  + 1 x 40\n32.7 m  PROMPT-4 5 x 80   R    > 18.4 (3 sig.)   50 SDSS 7 0.008  0.005\n32.7 m  PROMPT-5 5 x 80   I    > 17.8 (3 sig.)   20 SDSS 7 0.026  0.005\n62.0 m  GORT     6 x 80   R    > 18.8 (3 sig.)   34 SDSS 7 0.039  0.003\n76.8 m  GORT     9 x 80   I    > 18.7 (3 sig.)   43 SDSS 7 0.097  0.003\n117.3 m PROMPT-2 8 x 80   V    > 18.7 (3 sig.)   17 SDSS 7 0.019  0.006\n119.1 m PROMPT-4 11 x 80  R    > 19.1 (3 sig.)   62 SDSS 7 0.229  0.003\n119.2 m PROMPT-5 11 x 80  I    > 18.4 (3 sig.)   25 SDSS 7 0.117  0.003\n120.0 m PROMPT-3 10 x 80  B    > 19.4 (3 sig.)   26 SDSS 7 0.085  0.011\n3.2 h   PROMPT-3 24 x 80  B    > 21.3 (3 sig.)   26 SDSS 7 0.085  0.003\n3.2 h   GORT     16 x 80  I    > 19.2 (3 sig.)   43 SDSS 7 0.097  0.002\n3.4 h   GORT     20 x 80  R    > 20.0 (3 sig.)   34 SDSS 7 0.039  0.001\n3.5 h   PROMPT-2 67 x 80  V    21.05 +0.35 -0.27 17 SDSS 7 0.019  0.001\n3.5 h   PROMPT-5 66 x 80  I    20.60 +0.26 -0.21 25 SDSS 7 0.117  0.001\n3.5 h   PROMPT-4 65 x 80  R    21.35 +0.28 -0.22 62 SDSS 7 0.229  0.001\n3.6 h   PROMPT-3 37 x 80  U    > 19.5 (3 sig.)   30 SDSS 7 0.015  0.012\n\n* Transformed using Jester et al., 2005, ApJ, 130, 873.",
  "circularId": 9999,
  "createdOn": 1254977697000,
  "email": "haislip@physics.unc.edu",
  "subject": "GRB 090812: Skynet/PROMPT and GORT Observations",
  "submitter": "Josh Haislip at U.North Carolina  <haislip@physics.unc.edu>",
  "eventId": "GRB 090812"
}