{
  "bibcode": "2017GCN.20994....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 170405A (Troja et al. GCN 20984) on April 06, from \n10:23 to 11:01 UT (0.66 to 0.68 days since the GRB) with the 2-m LCO \nFaulkes Telescope North with the SDSS i and r filters. We do not detect \nthe optical afterglow (Troja et al; Malesani et al. GCN 20988; Klotz et \nal. GCN 20989; de Ugarte Postigo et al. GCN 20990; Martin-Carrillo et \nal. GCN 20991; Mazaeva et al. GCN 20992) down to the following limits:\n\nMid Time      Exposure       Filter       Magnitude (AB)\n(days)           (s)\n-------------------------------------------------------\n0.66           5x120          SDSS-R        > 21.6\n0.68           4x120          SDSS-I        > 21.6\n-------------------------------------------------------\n\nas calibrated against nearby Pan-STARRS objects. The nearby Pan-STARRS \nobject mentioned by Malesani et al. is clearly visible in our stacked \nframes.",
  "circularId": 20994,
  "createdOn": 1491483756000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 170405A: LCO FTN observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 170405A"
}