{
  "bibcode": "2004GCN..2926....1D",
  "body": "D. T. Durig (Cordell-Lorenz Observatory, Sewanee, TN, USA) reports on behalf of \nthe AAVSO International High Energy Network:\n\nObservations of the Swift error circle for GRB041217 (Palmer et al., GCN 2853) \nwere made with the Cordell-Lorenz Observatory 0.30m telescope + unfiltered CCD.\n\nEighteen 300-second exposures with UT midpoint of 2004-12-18T10:36 (1.1 days\nafter the burst) and twentythree 300-second exposures with UT midpoint of \n2004-12-20T10:26 (3.1 days) were stacked, with limiting sigma-3 magnitudes of \n20.0CR and 20.3CR based on USNOA2.0.  \n\nThe 47 arcmin x 47 arcmin field was centered at 10h 59m 53s -17d 51' 45\" \n(J2000.0), covering all of the error circle. \n\nNo new object is seen down to approximately CR=20.0 when comparing\nagainst a DSS2-R image. \n\nThe four candidates of Berger & Gonzalez (GCN 2859) are visible on both epochs \nbut don't show significant fading.\n\nExaming the images of the two epochs gives lower limit for an afterglow about \n20.0CR 1.1 days after the burst.\n\nThe combined FITS images can be found at:\n\nftp://ftp.aavso.org/grb/Dr.DougDurig_GRB041207_2453360.03964_.fits \nftp://ftp.aavso.org/grb/Dr.DouglasT.Durig_GRB041217_2453358.03701_.fits \n\n\nThe AAVSO International GRB network is greatful for a generous grant\nfrom the Curry Foundation and to NASA for the financial support for the\nHigh Energy Astrophysics Workshops for Amateur Astronomers.",
  "circularId": 2926,
  "createdOn": 1104439004000,
  "email": "oksanen@nyrola.jklsirius.fi",
  "subject": "GRB 041217: Optical observations",
  "submitter": "Arto Oksanen at Nyrola Obs., Finland  <oksanen@nyrola.jklsirius.fi>",
  "eventId": "GRB 041217"
}