{
  "bibcode": "2009GCN..9239....1O",
  "body": "Arto Oksanen (Hankasalmi Obs., Hankasalmi, Finland) reports via the AAVSO \nInternational High Energy Network the following optical observations of \nGRB 090424 (Cannizzo et al., GCN #9223):\n\nA. Oksanen reports the detection of the optical counterpart of GRB 090424 \napproximately 6.5 hours post-burst.  Unfiltered observations were made \nusing a 0.4-meter RC telescope with an SBIG STL-1001E CCD.  A total of \nsixty, 60-second observations were made having a mid-point time of \n20:45:00 UT on 2009 April 24.  The afterglow was detected with a magnitude \nof 19.1 +/- 0.1 measured relative to the R band magnitude of USNO-A2.0 \n1050-06753889 (R=16.3).  Astrometry of the afterglow position yields a \nposition of RA: 12h 38m 05.1s, Dec: +16d 50m 15.3s, in agreement with the \nUVOT coordinates given by Cannizzo et al. (GCN #9223).\n\nA jpeg preview of the observation showing the position of the afterglow is \navailable at this URL:\n\nhttp://murtoinen.dyndns.org:8888/ccd/grb/GRB090424/GRB090424-S001-R0XX-Clear.jpg\n\nA detailed report of the observation is available at the following URL:\nftp://ftp.aavso.org/grb/ArtoOksanen_GRB090424_2454946.42162_.txt\n\nA FITS image of this observation is available at the following URL:\nftp://ftp.aavso.org/grb/ArtoOksanen_GRB090424_2454946.42162_.fits\n\nThe AAVSO thanks the Curry Foundation for their continued support of the \nAAVSO International High Energy Network.",
  "circularId": 9239,
  "createdOn": 1240616452000,
  "email": "matthewt@aavso.org",
  "subject": "GRB 090424 optical observations",
  "submitter": "AAVSO GRB Network at AAVSO  <matthewt@aavso.org>",
  "eventId": "GRB 090424"
}