{
  "bibcode": "2010GCN.10681....1S",
  "body": "Jan Strobl (1), Martin Jelinek (2), Cyril Polasek (1), Petr Kubanek (2,3),\nMartin Nekola (1), Matus Kocka (1), Michal Jakubec (1) and Rene Hudec (1)\n(1. ASU AVCR Ondrejov, 2. IAA Granada, 3. GACE Valencia)\n\nWe observed the field of Swift GRB 100424A (Hoversten et al., GCNC 10667) \nwith the 0.5m telescope D50 in Ondrejov (Czech Republic), starting at \n23:27:02 UT, i.e. 06:54:20 after the trigger. A sequence of 20s unfiltered \nimages was obtained. We coadded 60x20s exposure, obtaining an image with a \nlimitting magnitude Rc~19.3, with an effective exposure time 7.35h after \nthe trigger (23:54UT). We do not detect any new source within the XRT \nlocalization (Evans et al., GCN10699).\n\nThis message can be cited.",
  "circularId": 10681,
  "createdOn": 1272188132000,
  "email": "jan@strobl.cz",
  "subject": "GRB 100424A: D50 optical limits",
  "submitter": "Jan Strobl at AI AS CR,Ondrejov  <jan@strobl.cz>",
  "eventId": "GRB 100424A"
}