{
  "bibcode": "2020GCN.29099....1J",
  "body": "Martin Jelinek, Jan Strobl (ASU CAS Ondrejov, CZ),\nMartin Masek, Petr Janecek, Sergey Karpov, Jakub\nJurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and\nMichael Prouza (Institute of Physics, Prague, CZ)\n\nreport:\n\nThe 30cm robotic telescope FRAM-Auger in Malargue (Argentina) reacted\nrobotically to the Swift/BAT alert of GRB201221A (Page et al., GCNC 29096,\nEvans et al., GCNC 29097), starting with a series of 20 s R-band images at\n07:10:13 UT, i.e. 72 s post trigger.\n\nWe do not detect any new or strongly variable source at or around the\nreported gamma-ray errorbox in single frames nor in a combined 20 x 20 s\nimage spanning the period from 1.2 min to 12.1 min after the initial\ntrigger. The combined exposure has a 3-sigma limiting magnitude R(Vega) ~\n17.5.",
  "circularId": 29099,
  "createdOn": 1608539350000,
  "email": "martin.jelinek@asu.cas.cz",
  "subject": "GRB 201221A: FRAM-Auger optical limit",
  "submitter": "Martin Jelinek at Astro.Inst-AVCR,Ondrejov  <martin.jelinek@asu.cas.cz>",
  "eventId": "GRB 201221A"
}