{
  "bibcode": "2017GCN.21953....1J",
  "body": "Martin Jelinek, Jan Strobl and Rene Hudec (ASU CAS Ondrejov)\n\nWe observed the field of the Swift GRB171001A (trigger #775553, Lien et al.\nGCNC 21946) with the 0.5m telescope of Ondrejov observatory, the obseration\nstarted at 21:17UT, i.e. about 2.9h after trigger and lasted for 30 miutes,\nwhen the field became observable. On a series of unfiltered exposures we do\nnot detect any new object within or in the vicinity of the XRT errorbox\n(Evans et al., GCNC 21952) down to the USNO-B/R2 calibrated limit  of\nR>20.0.",
  "circularId": 21953,
  "createdOn": 1506898208000,
  "email": "martin.jelinek@asu.cas.cz",
  "subject": "GRB171001A: D50 optical limit",
  "submitter": "Martin Jelinek at Astro.Inst-AVCR,Ondrejov  <martin.jelinek@asu.cas.cz>",
  "eventId": "GRB 171001A"
}