{
  "bibcode": "2015GCN.17869....1D",
  "body": "S. Dichiara, C. Guidorzi (U. Ferrara), S.Kobayashi (LJMU),\nC.G. Mundell (U. Bath), A. Gomboc (U. Ljubljana) on behalf\nof a larger collaboration report:\n\nOn May 24 we re-observed GRB 150523A (Yu et al GCN 17863;\nBissaldi et al. GCN 17864) using the 2-m Faulkes Telescope South\n(FTS) with SDSS r and i filters, starting from 08:53 UT (~23.4 hours\npost burst). Compared with our previous report (Dichiara et al.\nGCN 17868) the optical candidate appears to have significantly\nfaded, as follows:\n\nMid time(hrs)    Exp(s)       Filter   Magnitude\n-----------------------------------------------\n13.87            10x120          r'    20.45 +- 0.15\n23.69            10x120          r'    21.20 +- 0.22\n-----------------------------------------------\n\nThe corresponding average power-law decay index is 1.3 +- 0.5.\nMagnitudes are calibrated against USNOB-1 nearby stars.\nWe therefore confirm the afterglow nature of the optical\ncandidate previously reported.",
  "circularId": 17869,
  "createdOn": 1432548393000,
  "email": "dichiara@fe.infn.it",
  "subject": "GRB 150523A: LCOGT FTS afterglow confirmation",
  "submitter": "Simone Dichiara at Ferrara U/Italy  <dichiara@fe.infn.it>",
  "eventId": "GRB 150523A"
}