{
  "bibcode": "2015GCN.18520....1D",
  "body": "S. Dichiara (U. Ferrara, ICRANet), D. Kopac (U. Ljubljana), C. Guidorzi\n(U. Ferrara), S. Kobayashi (LJMU), A. Gomboc (U. Ljubljana) on behalf of\na larger collaboration report:\n\nThe 2-m Faulkes Telescope North in Hawaii began observing Swift\nGRB 151027B (Ukwatta et al., GCN 18499) on October 28, 12:18:25 UT, i.e.,\n~ 13.6 hours after the burst trigger, with the r' and i' filters.\n\nAlthough we did not detect the optical counterpart (Malesani et al.,\n GCN 18501; Xu et al., GCN 18505; Wiseman et al., GCN 18507;\nBuckley et al., GCN 18511; Watson et al., GCN 18512) in the r'\nfilter (R > 20.3), the source is detected in the i' filter with\nI = 19.6 +/- 0.3 mag at a mid time of 13.9 hours post burst\n(total exposure in i' of 600 s).\n\nThe magnitude is calibrated against nearby USNO-B1 stars.",
  "circularId": 18520,
  "createdOn": 1446063187000,
  "email": "dichiara@fe.infn.it",
  "subject": "GRB 151027B: LCOGT FTN afterglow observations",
  "submitter": "Simone Dichiara at Ferrara U/Italy  <dichiara@fe.infn.it>",
  "eventId": "GRB 151027B"
}