{
  "bibcode": "2004GCN..2563....1T",
  "body": "P. Tikkanen and A. Oksanen on behalf of Nyrola observatory GRB Team \nand AAVSO International High Energy Network report:\n\nA 24 x 16 arcmin field covering the INTEGRAL error circle of GRB\n040403 (GCN 2560) was imaged with the 0.4m SCT of the Nyrola\nObservatory starting at April 3, 2004 20:05 UT, 15.0 hours \nafter the burst. Observation was taken under quite poor conditions,\nbright moonlight, northern lights and moderate seeing.\n \nTotal of 53 four minute Rc-exposures, exposure time of 12720 seconds, \nwere sigma reject combined and compared against the Digitized Sky \nSurvey (DSS2R). \n\nNo new objects brighter than DSS2 plate limit was detected, but some \nfainter objects were also present inside error circle. The faintest \nstars on the combined image are about Rc=20.4 (USNOA2.0 reference).\n\nThe combined image is available on web:\nhttp://nyrola.jklsirius.fi/grb/grb040403\n\nNyrola observatory wants to express gratitude to AAVSO for loaning\nthe CCD camera and to Wihuri foundation for generous grants for the \nobservatory.\n\nThe AAVSO International High Energy network is grateful for a\ngenerous grant from the Curry Foundation and to NASA for the \nfinancial support for the High Energy Workshops for Amateur \nAstronomers.",
  "circularId": 2563,
  "createdOn": 1081119579000,
  "email": "oksanen@nyrola.jklsirius.fi",
  "subject": "GRB 040403: Optical observations",
  "submitter": "Arto Oksanen at Nyrola Obs., Finland  <oksanen@nyrola.jklsirius.fi>",
  "eventId": "GRB 040403"
}