{
  "bibcode": "2018GCN.23024....1J",
  "body": "M. Jelinek, J. Strobl, R. Hudec, C. Polasek (ASU CAS Ondrejov)\nreport:\n\nWe observed the position of the bright GRB 180720B (Siegel et al., GCN \n22973 & GCN 22975) with the D50 telescope of the Astronomical Institute \nOndrejov, near Prague, Czech Republic. We performed a series of ~300x 20s \nunfiltered exposures as soon as the position became accessible above local \nhorizon, between 9.8 and 12h after the trigger.\n\nThe optical afterglow (Martone et al., GCN 22976; Sasada et al., GCN \n22977; Reva et al., GCN 22979; Itoh et al., GCN 22983) is clearly detected \nin single 20 s images.\n\nWe confirm the stationary behaviour during our observations as reported by \nKann et al. (GCN 22985) - the afterglow might have faded as few as 0.04 \nmag between 10 and 11h after the GRB trigger.",
  "circularId": 23024,
  "createdOn": 1532377317000,
  "email": "jan@strobl.cz",
  "subject": "GRB 180720B: D50 optical observations",
  "submitter": "Jan Strobl at AI AS CR,Ondrejov  <jan@strobl.cz>",
  "eventId": "GRB 180720B"
}