{
  "bibcode": "2000GCN...646....1M",
  "body": "N. Mirabal, J. P. Halpern, J. Kemp, & D. J. Helfand (Columbia U.)\nreport on behalf of the MDM Observatory GRB follow-up team:\n\n\"The potential K-band counterpart of GRB 000418 reported by\nKlose et al. (GCN #645) is present in an R-band image which\nwe obtained on the MDM 2.4m telescope on April 21, 03:33 UT.\nIts position is (J2000) RA 12 25 19.30, Dec. +20 06 11.1,\nwith an uncertainty of 0.\"5.  Under non-photometric conditions\nwe measure R = 21.52 +/- 0.12 for this candidate, referenced\nto a USNO star at (J2000) RA 12 25 25.62, Dec. +20 04 57.8 which\nis listed as R = 15.4.  An additional systematic uncertainty\nof 0.2 mag should be assumed based on the dispersion among\nother USNO star magnitudes in this field.\n\nFurther observations are needed to determine if this object\nis fading.\n\nThis message may be cited.\"",
  "circularId": 646,
  "createdOn": 956703623000,
  "email": "abulafia@astro.columbia.edu",
  "subject": "GRB 000418, Optical Observation",
  "submitter": "Nestor Mirabal at Columbia U.  <abulafia@astro.columbia.edu>",
  "eventId": "GRB 000418"
}