{
  "bibcode": "2000GCN...692....1D",
  "body": "A. Diercks and I. Cotoros report on behalf of the Caltech-NRAO-CARA\nGRB collaboration:\n\nWe have examined our Gunn-r images of the GRB000604 error box\n(Hurley et al, GCN #687) from June 6.24 - 6.28 UT (Cotoros et al, GCN\n#688) and do not detect the object reported by Leibowitz (GCN #690).\nThe coordinates of Leibowitz's candidate fall within the overlap of\nour two pointings and the combined image (5x500s) has a 5-sigma\ndetection limit measured relative to several USNO A2.0 stars of\napproximately r ~ 22.0 +/- 0.2, though this calibration should be\nconsidered preliminary pending more accurate photometry of the region.\n\nWe find for Leibowitz's Star A (as shown in the finding chart\nhttp://wise-obs.tau.ac.il/~eran/GRB000604/) RA=15:35:52.6,10:41:08.8\n+/- 1 arcsec measured against 58 USNO A2.0 stars.  At the resolution\nof our images, Leibowitz's \"Star B\" is identifable as a galaxy.\n\nIn addition, we have re-imaged the entire IPN error box with the\nPalomar 60\" from June 7.26 - 7.30 UT in Gunn-r (5x500s).  Lebowitz's\nobject is not detected in our combined image which has a similar\nlimiting magnitude as the June 6 data.\n\nGiven the non-detection of Leibowitz's candidate in our data at epochs\nwhich bracket the Wise observations, we believe this object is not\nrelated to GRB000604.\n\nAn image of the field is available at:\nhttp://astro.caltech.edu/~ad/grb000604/grb_im.ps\n\nThis message may be cited.",
  "circularId": 692,
  "createdOn": 960397764000,
  "email": "ad@astro.caltech.edu",
  "subject": "GRB000604, optical observations",
  "submitter": "Alan H. Diercks at Caltech  <ad@astro.caltech.edu>",
  "eventId": "GRB 000604"
}