{
  "bibcode": "2015GCN.18090....1D",
  "body": "S. Dichiara, C. Guidorzi (U. Ferrara), C.G. Mundell (U. Bath),\nS. Kobayashi (LJMU), A. Gomboc (U. Ljubljana) on behalf of\na large collaboration report:\n\nThe 2-m Faulkes Telescope North began observing Swift GRB 150728A\n(Krimm et al. GCN 18087) on July 28, 13:48:25 UT (~57 minutes after\nthe BAT trigger) with SDSS r and i filters.\n\nwe identify an uncatalogued object within XRT error circle\n(Beardmore et al. GCN 18088), at the following position:\n\nRA(J2000) = 19:28:54.81\nDec(J2000)= +33:54:58.0\n\nwith an uncertainty of 1\". The counterpart has the following\n magnitudes:\n\nMid time from  Total Exp   Filter    Magnitude\ntrigger (min)   (s)\n-------------------------------------------------\n61.8            120x5        r'     21.8 +- 0.3\n73.3            120x5        i'     20.7 +- 0.3\n-------------------------------------------------\n\nMagnitudes are calibrated against nearby USNOB-1 stars\n(R2 and I).\nPresently we cannot state anything about possible variability in\nthe source flux. However, we note that field is quite crowded.",
  "circularId": 18090,
  "createdOn": 1438103258000,
  "email": "dichiara@fe.infn.it",
  "subject": "GRB 150728A: FTN observations",
  "submitter": "Simone Dichiara at Ferrara U/Italy  <dichiara@fe.infn.it>",
  "eventId": "GRB 150728A"
}