{
  "bibcode": "2004GCN..2907....1C",
  "body": "S. Covino, F.M. Zerbi, E. Palazzi, G. Chincarini, G. Tagliaferri, E. \nMolinari, V. Testa, G. Tosti, A. Monfardini, A. Di Paola, M. Rodon�, \nL.A. Antonelli, P. Conconi, G. Cutispoto, P. D'Avanzo, L. Nicastro, on \nbehalf of the REM/ROSS team, report:\n\nWe imaged the field of GRB 041223 (Tueller et al., GCN 2898; Burrows et \nal., GCN 2901) with the robotic 60-cm REM telescope located at La Silla, \nChile. Observations were carried both in the NIR and in the optical, on \n2004 Dec 24 from 02:37 UT to 03:11 UT (i.e. ~12 hours after the burst). \nREM was equipped with the REMIR near-IR camera (10x10 sq arcmin FoV, JHK \nfilters) and the ROSS optical spectrograph/imager (10x10 sq arcmin FoV, \nVRI filters).\n\nObservations were performed under good seeing conditions. The net \nexposure times were: J: 500s; H: 500s; K: 500s; V: 150s; R: 150s; I: 150s.\n\nThe comparison with the 2MASS catalog did not reveal new infrared \nsources with S/N>5 at the limit of the catalog. In particular no source \nis present at the position of the X-ray afterglow detected by Swift-XRT \n(Burrows et al. GCN 2901) and of the optical transient reported by \nBerger et al. (GCN 2902) and Malesani et al. (GCN 2903).\n\nAlso the optical observations, partly affected by the bright Moon, did \nnot show any convincing candidate. The 3-sigma upper limit in the R band \nis R ~ 18.\n\nThis message is citeable.",
  "circularId": 2907,
  "createdOn": 1103906279000,
  "email": "malesani@sissa.it",
  "subject": "GRB041223: optical and NIR observations with REM",
  "submitter": "Daniele Malesani at SISSA-ISAS,Trieste,Italy  <malesani@sissa.it>",
  "eventId": "GRB 041223"
}