{
  "bibcode": "2015GCN.18518....1S",
  "body": "E. Sonbas (Adiyaman Univ.), T. Guver (Istanbul Univ.), E. Gogus (Sabanci\nUniv.), O. Erece, M. Kocak, S. Eryilmaz, H. Kirbiyik (TUG) report on behalf\nof a larger collaboration\n\n\nWe observed the field of Swift GRB 151027A (Maselli et al., GCN#18478) with\nthe 1.0 meter T100 telescope (Bakirlitepe, TUBITAK National Observatory,\nTurkey), starting October, 27, 18:32:21 UT (~ 14.5 hours after the\ntrigger). Observations were carried out in the R filter. The afterglow is\ndetected in the R band images with an exposure time of 150 s.\n\n\nUsing USNO-B1 star USNO-B1 1513-0237223 (R.A.=272.49, Dec=+61.37) in the\nfield, the magnitudes of the OT were estimated as follows;\n\n\nt-t0 (hr) exp.(s) filt mag err (+/-)\n\n14.56 150 R 16.8 0.06\n\n14.61 150 R 17.2 0.08\n\n\nAnalysis of further observations with the same filter is ongoing.\n\n\nWe thank to TUBITAK National Observatory for a partial support in using\nT100 telescope with project number 10CT100-95 and technical support.",
  "circularId": 18518,
  "createdOn": 1446053837000,
  "email": "edasonbas@gmail.com",
  "subject": "GRB 151027A: T100 observations",
  "submitter": "Eda Sonbas at NASA/GSFC  <edasonbas@gmail.com>",
  "eventId": "GRB 151027A"
}