{
  "bibcode": "2000GCN...733....1M",
  "body": "M. Metzger, A. Fruchter, N. Masetti, E. Palazzi, E. Pian, S. Klose,\nand B. Stecklum report for a larger HST GRB Collaboration:\n\nThe field of GRB 000418 was observed by the Hubble Space Telescope\nusing the STIS camera in open (50CCD) mode on UT 2000 June 4.17.  The\nposition of the transient with respect to the STIS image was made by\nperforming relative astrometry of early infrared images of the\ntransient from the Calar Alto 3.5m (GCN 645) and optical images on Apr\n20.9 UT from the Telescopio Nazionale Galileo 3.5m with deep late-time\nimages from Keck (GCN 669).  The transient position on the Keck images\nwas then transformed to the STIS image.\n\nNear the position of the transient, a compact galaxy with half-light\nradius of 0.13 arcsec is detected with R = 23.9 +- 0.2 mag (where much\nof the photometric uncertainty is due to the uncertain spectral energy\ndistribution of the galaxy).  The best fit position of the OT is\napprox 0\".08 +- 0\".15 arcsec east of the center of this galaxy, which\nwe infer is the likely host.  The magnitude measured is within a few\ntenths of a magnitude of the May 6 Keck measurement (GCN 669), and\nthus the OT does not likely contribute significant flux to the host in\nthe STIS image.\n\nThe next nearest galaxies to the transient is a pair approx 2 arcsec\nsoutheast of the host and are detected in both the STIS and Keck\nimages at total R magnitude of 26.2 +- 0.3 mag.  The pair shows no\nsignificant extension toward the host galaxy in either the STIS or\nKeck images.\n\nA reduced image of the STIS field, with transient location indicated, can\nbe obtained at http://www.stsci.edu/~fruchter/GRB/000418.\n\nThis message may be cited.",
  "circularId": 733,
  "createdOn": 962262361000,
  "email": "mrm@astro.caltech.edu",
  "subject": "GRB000418, HST/STIS Observations",
  "submitter": "Mark R. Metzger at CIT  <mrm@astro.caltech.edu>",
  "eventId": "GRB 000418"
}