{
  "bibcode": "2019GCN.23669....1J",
  "body": "Martin Jelinek and Jan Strobl (ASU CAS Ondrejov, CZ),\nMartin Masek, Petr Janecek, Sergey Karpov, Jakub Jurysek,\nJan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza\n(Institute of Physics, Prague, CZ)\n\nreport:\n\nThe 25cm robotic telescope FRAM-ORM at La Palma (Spain)\nreacted robotically to the alert of GRB181228A (Moss et\nal, GCNC 23570), obtaining a series of 20s R-band images\nstarting at 02:53:51.1UT, i.e. 34s post trigger.\n\nWe do not detect any new source in comparison to USNO-B1.0\ncatalog neither in single images (3-sigma limit R>~17.1)\nnor in a combined 20x20s frame (mean exp time 269s post\ntrigger, 3-sigma limit R>~18.7).\n\n\nMartin Jel��nek, +420602105255, +34617840945, lascaux.asu.cas.cz/mates\n       Astronomick�� ��stav AV��R, Ond��ejov",
  "circularId": 23669,
  "createdOn": 1547105200000,
  "email": "martin.jelinek@asu.cas.cz",
  "subject": "GRB 181228A: FRAM-ORM optical limit",
  "submitter": "Martin Jelinek at Astro.Inst-AVCR,Ondrejov  <martin.jelinek@asu.cas.cz>",
  "eventId": "GRB 181228A"
}