{
  "version": 2,
  "bibcode": "2003GCN..2326....1D",
  "createdOn": 1059233335000,
  "body": "Magellan Observations of XRF030723 (=H2777)\n\nA. Dullighan, N. Butler, R. Vanderspek, J. Villasenor,  and G. Ricker (MIT)\n\nwrite:\n\nWe have observed the SXC error circle for the HETE-discovered X-ray \nflash XRF030723(=H2777; Prigozhin et al, GCN 2313) with the LDSS2 \ninstrument on the 6.5m Magellan Clay telescope at Las Campanas \nObservatory in Chile. Four 6 minute Harris R-band exposures were \ntaken in an interval centered on July 24.31 UT, extending from 24.8 h \nto 25.2 hours after the burst.  The seeing was ~0.6 arcsec. \nCoaddition of the images gives a limiting magnitude of R = 24.5 \nmagnitudes.\n\nWe detect the suggested optical counterpart (Fox et al., GCN 2323) of \nGRB 030723 at R = 21.13 +/- 0.05 magnitudes.  Combining our \nphotometry with that of Fox et al, we estimate a power law decay \nindex of 1.6. Our measurements have been calibrated against the \nrecent USNO photometry data reported by Henden in GCN 2317.\n\nWe gratefully acknowledge observational assistance by A. McWilliam and D. Osip.\n\nThis message may be cited.",
  "editedOn": 1777052913008,
  "circularId": 2326,
  "eventId": "XRF 030723",
  "email": "grr@space.mit.edu",
  "submitter": "George Ricker at MIT  <grr@space.mit.edu>",
  "subject": "Magellan Observations of XRF030723 (=H2777)",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>"
}