{
  "bibcode": "2004GCN..2686....1J",
  "body": "Brian L. Jensen (U. Copenhagen), Arnaud Cassan (IAP, Paris), Dijana\nDominis (U. Potsdam), Jens Hjorth, Johan Fynbo (U. Copenhagen), Michael\nI. Andersen (AIP, Potsdam), Javier Gorosabel (IAA-CSIC, Granada) report:\n\n\"We report optical observations, covering ~90% of the refined 7'\nerror-circle (HETE#11553-2) of GRB040825A, taken with the Danish 1.54m\ntelescope at La Silla (FoV=13.7'), as follows:\n\nDate midobs (UT) | t_b+  | filter:expt | seeing | 3sig limit\n------------------------------------------------------------\nAug. 26.30, 2004   27.7h    R:14x600s     ~1.1\"     R~23.5\nAug. 26.31, 2004   27.9h    V:12x600s     ~1.4\"     V~23.3\nAug. 27.31, 2004   51.9h    R:18x600s     ~1.5\"     R~23.0\nAug. 28.28, 2004   75.2h    I:13x300s     ~2.1\"     I~21.0\n\nPhotometric calibration is based on Henden et al. (GCN#2668).\n\nVisual comparison of the three main epochs reveals no candidate optical\nafterglow down to R~23.0\"\n\n[GCN OPS NOTE (02Sep04 11:15 UT): The second column (t_b+) of the table\nhad a wrong offset in the original posting (should have been 12.8h larger).\nThis archived copy of the circular has the corrected t_b+ values.]",
  "circularId": 2686,
  "createdOn": 1094038249000,
  "email": "brian_j@astro.ku.dk",
  "subject": "GRB040825A: Optical observations",
  "submitter": "Brian Lindgren Jensen at U.of Copenhagen  <brian_j@astro.ku.dk>",
  "eventId": "GRB 040825A"
}