{
  "bibcode": "2005GCN..3700....1P",
  "body": "J. X. Prochaska (UCO/Lick), J. S. Bloom (UCB), H.-W. Chen (MIT),\nB. Hansen (UCLA), J. Kalirai (UCSC), M. Rich (UCLA) and H. Richer (UBC)\nreport on behalf of the GRAASP collaboration:\n\n\"We have obtained LRISb spectroscopy (900s; 2005-07-29 06:31 UT)\nof the putative host galaxy of GRB 050724 (Object D in GCN #3672).\nWe confirm our previously reported redshift (GCN #3679)\nbased on the identification of Ca H+K, G-band absorption features,\nand the 4000Ang break.  We report a redshift z=0.258 +/- 0.002.\nThe velocity dispersion based on CaK appears to exceed 200km/s.\nThe galaxy shows no [OII] emission in our spectrum suggesting minimal\ncurrent star formation.\n\nPAIRITEL imaging of the galaxy from July 29 UT yields a K-band magnitude\nof 15.3 +/- 0.2 in a 3\" radius aperture.  At this redshift,\nand including the effects of Galactic extinction, the galaxy\nis 1.7 L* based off the 2MASS luminosity function.\n\nThe properties of this galaxy -- a massive early-type at\nmoderate redshift -- are strikingly similar to the probable host\ngalaxy of GRB 050509b (GCN #3399).\n\nBased on this redshift and the reported fluence in GCN #3667,\nthe isotropic -equivalent energy release is\nE_gamma(iso) = 9.9e49 erg [19-440 keV, comoving], more than 1\norder of magnitude brighter than 050509b\n(Bloom et al. astro-ph/0505480).\"\n\nFigures and imaging can be found at this following site:\n    http://www.graasp.org/Data/050724",
  "circularId": 3700,
  "createdOn": 1122660833000,
  "email": "xavier@ucolick.org",
  "subject": "GRB 050724: Secure Host Redshift from Keck",
  "submitter": "Jason Prochaska at UCO/Lick Obs  <xavier@ucolick.org>",
  "eventId": "GRB 050724"
}