{
  "bibcode": "2016GCN.19955....1J",
  "body": "Martin Jelinek, Jan Strobl, Rene Hudec, Vojtech Simon\nand Cyril Polasek (ASU CAS Ondrejov, CZ) report:\n\nThe 50cm robotic telescope (D50) of Ondrejov\nobservatory in Czech republic reacted robotically to\nthe alert of GRB160927A (Gibson et al, GCNC 19952),\nobtaining a series of 10s unfiltered images starting at\n18:05:29.9UT, i.e. 40s post trigger.\n\nWe do not detect any new source within or near the XRT\nerror circle (Evans, GCNC 19953) in comparison to\nUSNO-B1.0 catalog neither in single images (3-sigma\nlimit R>18.7) nor in a combined 25x10s frame (mean exp\ntime 124s post trigger, 3-sigma limit R>20.5).",
  "circularId": 19955,
  "createdOn": 1475010590000,
  "email": "martin.jelinek@asu.cas.cz",
  "subject": "GRB160927A: D50 optical limit",
  "submitter": "Martin Jelinek at Astro.Inst-AVCR,Ondrejov  <martin.jelinek@asu.cas.cz>",
  "eventId": "GRB 160927A"
}