{
  "bibcode": "2017GCN.20901....1G",
  "body": "C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc \n(U. Nova Gorica), C.G. Mundell (U. Bath) on behalf of a large \ncollaboration report:\n\nWe observed Swift GRB 170317A (LaPorte et al. GCN 20885) on March 18, \n06:01 UT (0.84 days since the GRB) with the 2-m LCO Faulkes Telescope \nNorth with SDSS r and i filters. We marginally detect the optical \nafterglow (LaPorte et al.; Mazaeva et al. GCN 20886, 20893; Xin et al. \nGCN 20888; Mao et al. GCN 20889, 20890; Kuin et al. GCN 20894) in the r \nfilter with the following values:\n\nMid Time      Exposure       Filter       Magnitude (AB)\n(days)           (s)\n-------------------------------------------------------\n0.87          10x120          SDSS-R        22.9 +- 0.3\n0.88          10x120          SDSS-I        > 22.0\n-------------------------------------------------------\n\nas calibrated against nearby PanSTARRS-1 DR1 objects.",
  "circularId": 20901,
  "createdOn": 1489830986000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 170317A: LCO FTN observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 170317A"
}