{
  "bibcode": "2010GCN.11269....1J",
  "body": "Martin Jelinek, Javier Gorosabel (IAA-CSIC) and Sergio Simon \n(IAC-ULL) report on behalf of a larger colaboration:\n\n\"We observed the optical afterglow of GRB100909A (Mereghetti\net al. GCNC11260; Siegel et al. GCNC11261; Guidorzi et al.\nGCNC 11265) with the 2.56m Nordic Optical Telescope equipped\nwith ALFOSC, starting on September 10 at 4:30 UT (i.e. 19.4h\nafter the burst).\n\nA preliminary analysis of the 600-s R-band exposure shows the\nproposed afterglow with magnitude R~23.2 in respect to the\nR2=18.54 object mentioned by Guidorzi et al. (GCNC11265).\nThis implies a decay rate alpha~1.6, and confirms the fading\nnature of the object.\n\nThis message may be cited.\"",
  "circularId": 11269,
  "createdOn": 1284097128000,
  "email": "mates@iaa.es",
  "subject": "GRB100909A: NOT optical afterglow confirmation",
  "submitter": "Martin Jelinek at Inst.Astrophys.Andalucia,Granada  <mates@iaa.es>",
  "eventId": "GRB 100909A"
}