{
  "bibcode": "2017GCN.21110....1G",
  "body": "C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc \n(U. Nova Gorica), C.G. Mundell (U. Bath), A. Cucchiara, D. Morris, B. \nGendre (U. of Virgin Islands) on behalf of a large collaboration report:\n\nWe began observing Fermi GRB 170510A (Bissaldi et al. GCN 21081) on May \n10, 12:14 UT (7.0 hours since the GRB) with a 1-m LCO unit with the SDSS \ni filter.  Within the Swift-XRT error circle (Cholden-Brown et al. GCN \n21103) we clearly detect the optical afterglow candidate (Cucchiara et \nal. GCN 21087; Lipunov et al. GCN 21091) at the following position:\n\nRA(J2000) =  10:40:36.89\nDEC(J2000)= -39:12:45.2\n\nwith an error radius of 1.0\", with the following value:\n\nMid Time     Exposure       Filter       Magnitude (AB)\n(hours)        (s)\n-------------------------------------------------------\n7.1           5x120         SDSS-I        18.60 +- 0.07\n-------------------------------------------------------\n\nas calibrated against nearby UCAC4 stars.",
  "circularId": 21110,
  "createdOn": 1495201660000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 170510A: LCO Siding Springs early observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 170510A"
}