{
  "bibcode": "2010GCN.11339....1S",
  "body": "Jan Strobl (1,2), Martin Nekola (1), Martin Blazek (1,2), Martin Jelinek\n(3), Cyril Polasek (1), Petr Kubanek (3,4), Matus Kocka (1) and\nRene Hudec (1,2)\n(1. ASU AVCR Ondrejov, 2. FEL CVUT Praha, 3. IAA Granada, 4. IPL UV\nValencia)\n\nWe report on the observation of the field of the Swift GRB 100902A \n(Sakamoto et al., GCN 11181) with the 0.5m telescope D50 in Ondrejov \n(Czech Republic), starting at 22:03:08 UT, i.e. ~2.5h after the trigger.\nA sequence of 20s unfiltered images was obtained. We coadded 225x20s \nexposure, obtaining an image with a limitting magnitude Rc~19.1, with an \neffective exposure time 3.68h after the trigger (23:13 UT). We do not \ndetect any new source within the XRT error circle (Beardmore et al., GCN \n11188).\n\nThis message can be cited.\n\n[GCN OPS NOTE(13oct10):  Per author's request, the affilation footnotes\nwere fixed.]",
  "circularId": 11339,
  "createdOn": 1286985264000,
  "email": "jan@strobl.cz",
  "subject": "GRB 100902A: D50 optical limit",
  "submitter": "Jan Strobl at AI AS CR,Ondrejov  <jan@strobl.cz>",
  "eventId": "GRB 100902A"
}