{
  "bibcode": "2000GCN...756....1B",
  "body": "GRB 990510 Host Galaxy Discovery\n\nJ. S. Bloom, on behalf of the larger Caltech-NRAO-CARA GRB\nCollaboration, reports:\n\n\"We have discovered a faint extended source nearly coincident with the\nposition of GRB 990510. This source, which we identify as the host galaxy\nof GRB 990510, is visible in new HST/STIS imaging taken on 29 April 2000\nas part of the HST proposal #8189 (see Fruchter et al. GCN #386) and made\npublic on 28 July 2000. The total integration time is 5840 s taken in 8\nindividual exposures. Registration of the early epoch (17 June 1999) where\nthe OT was bright reveals the OT occurred (0.064\" +/- 0.009\") West\nand (0.015\" +/- 0.012\") North of the center of the host\ngalaxy.  This amounts to a significant displacement of (66 +/- 9) mas or\n~600 pc at a distance of z=1.62 (Galama et al. 1999), though the OT does\nappear to reside within the detectable light of the galaxy.  The galaxy\nextension is PA=80.5 +/- 1.5 deg with an ellipticity of about ~0.5.  \nPreliminary magnitude estimates reveal that V_host = 28.5 +/- 0.5 mag\n(referenced to star C of Beuermann et al. 1999).  The host does appear to\nbe marginally detected in the July 1999 imaging as well (although see GCN\n#386).\"\n\nAn image of the field from both epochs as well as a close-up of the\nhost and the 3-sigma location of the GRB can be found at:\n   http://astro.caltech.edu/~jsb/grb990510-host.ps\n\nThis message may be cited.",
  "circularId": 756,
  "createdOn": 964917132000,
  "email": "jsb@astro.caltech.edu",
  "subject": "GRB 990510 Host Galaxy Discovery",
  "submitter": "Josh Bloom at CIT  <jsb@astro.caltech.edu>",
  "eventId": "GRB 990510"
}