{
  "bibcode": "2011GCN.12769....1G",
  "body": "T. Guver (Sabanci Univ.), E. Sonbas (Adiyaman Univ.), S. Kaynar  \n(Akdeniz Univ.), E. Gogus (Sabanci Univ.), Z. Eker (TUG) report on  \nbehalf of a larger collaboration\n\nWe observed the field of Swift GRB 111228A (Ukwatta et al., GCN 12737)  \nwith the 1.0 meter T100 telescope (TUBITAK National Observatory,  \nAntalya - Turkey), starting December, 28, 22:48 UT (~ 7 hours after  \nthe trigger). Observations were carried out in the B, R, and V filters  \nunder good weather conditions. The afterglow is clearly detected in  \nall images.\n\nUsing the USNO-B1 star USNO-B1 1083-0199833 (RA = 10:00:22.72, Dec =  \n+18:19:23.85 - same as used by Klotz et al., GCN 12746 and Nascimbeni  \net al., GCN 12748) in the field we estimated the following magnitudes  \nfor the OT:\n\nt - t0 (h)       Exp. (s)      Filter            mag.        err\n6.859            300            B               19.12      +/- 0.04\n6.958            300            B               19.56      +/- 0.07\n8.219            300            B               19.58      +/- 0.04\n8.317            300            B               19.39      +/- 0.05\n7.057            300            R               18.45      +/- 0.02\n7.155            300            R               18.50      +/- 0.02\n8.416            300            R               18.58      +/- 0.02\n8.514            300            R               18.61      +/- 0.03\n\nWe are grateful to the TUBITAK National Observatory staff for promptly  \nscheduling the observations and their technical support.\n\n\n----------------------------------------------------------------\nThis message was sent using IMP, the Internet Messaging Program.",
  "circularId": 12769,
  "createdOn": 1325176606000,
  "email": "tolga@physics.arizona.edu",
  "subject": "GRB 111228A: T100 observations",
  "submitter": "Tolga Guver at UA  <tolga@physics.arizona.edu>",
  "eventId": "GRB 111228A"
}