{
  "bibcode": "2017GCN.22033....1G",
  "body": "C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), \nA. Gomboc (U. Nova Gorica), I.A. Steele (LJMU) on behalf of a large \ncollaboration report:\n\nThe 2-m Liverpool Telescope automatically began observing Swift GRB \n171020A (Page et al. GCN 22028) on October 20, 23:10:12 UT (3.0 minutes \nfrom the GRB trigger time) with the RINGO3 polarimeter and the IO:O \ncamera in the SDSS-R filter. We clearly detect the optical afterglow \n(Malesani et al, GCN 22029; Moskvitin et al., GCN 22031) with the \nfollowing magnitude:\n\nMid Time���������� Exposure������������ Filter������������ Magnitude (AB)\n(min)�������������������� (s)\n-------------------------------------------------------\n35.8���������������������� 6x10���������������� SDSS-R������������ 21.12 +- 0.14\n-------------------------------------------------------\n\nas calibrated against nearby Pan-STARRS objects.",
  "circularId": 22033,
  "createdOn": 1508567448000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 171020A: LT observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 171020A"
}