{
  "bibcode": "2013GCN.14475....1S",
  "body": "E. Sonbas (Adiyaman Univ.), T. Guver (Sabanci Univ.), E. Gogus (Sabanci\nUniv.), H. Kirbiyik (TUG) report on behalf of a larger collaboration\n\nWe observed the field of Swift  GRB 130427A (Maselli et al. GCN#14448)\nwith  the  1.0 meter  T100  telescope  (TUBITAK National  Observatory,\nAntalya - Turkey),  starting April, 27, 20:39:28 UT (~ 13 hours after\nthe trigger). Observations were carried out in the R filter under good\nweather conditions. The afterglow is clearly  detected in 60 s R band\nimages at a position that is consistent with Elenin et al. GCN#14450\n\nUsing USNO-B1 star USNO-B1 1177-0254824  (RA=  11:32:31.23, Dec=\n+27:42:23.02 ) in the field, the magnitudes of the OT were estimated as\nfollows;\n\nt-t0 (hr)         exp.(s)      filt            mag             err (+/-)\n12.850        60               R            16.2              0.05\n12.871        60               R            16.6              0.03\n12.874        60               R            16.3              0.03\n12.877        60               R             16.5             0.01\n\nFurther observations using the same filter are ongoing.\n\nWe are grateful to the TUBITAK National Observatory staff for promptly\nscheduling the observations and their technical support.",
  "circularId": 14475,
  "createdOn": 1367102359000,
  "email": "edasonbas@gmail.com",
  "subject": "GRB 130427A: T100 observations",
  "submitter": "Eda Sonbas at NASA/GSFC  <edasonbas@gmail.com>",
  "eventId": "GRB 130427A"
}