{
  "bibcode": "2016GCN.20080....1G",
  "body": "C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), C.G. Mundell \n(U. Bath), A. Gomboc (U. Nova Gorica), N.R. Tanvir (U. Leicester) on \nbehalf of a large collaboration report:\n\nThe 2-m Liverpool Telescope observed Swift GRB161017A (Troja et al., GCN \n20064) in the SDSS r and i filters on October 19, from 03:45 to 05:37 UT \n(mid time~1.45 days since the GRB). We clearly detect the optical \nafterglow (Yurkov et al. GCN 20063; Troja et al. GCN 20064; de \nUgarte-Postigo et al. GCN 20069; Fujiwara et al GCN 20070; Melandri et \nal. GCN 20071) with the following values, as calibrated against nearby \nSDSS stars:\n\nMid Time      Exposure       Filter       Magnitude\n(days)           (s)\n-------------------------------------------------------\n1.42            5x120         SDSS-R      20.02 +- 0.03\n1.42            5x120         SDSS-I      19.80 +- 0.03\n-------------------------------------------------------\n\nCompared with our previous report (Guidorzi et al. GCN 20072), we \nestimate an average power-law decay index alpha~1.3 between 0.68 and \n1.45 days post burst.",
  "circularId": 20080,
  "createdOn": 1476865780000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 161017A: LT optical observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 161017A"
}