{
  "bibcode": "2005GCN..3390....1P",
  "body": "J. X. Prochaska (UCO/Lick), M. Cooper (UCB), J. Newman (LBNL),\nJ. S. Bloom (UCB), K. Hurley, (SSL/UCB), C. Blake (Harvard),\nB. Gerke (UCB), and H. W. Chen (MIT) report:\n\n\"We have acquired a DEIMOS longslit spectrum of the galaxy at ra\n12:36:12.90, dec +28:58:58.8 (J2000) (=2MASS 2MASX J12361286+2858580)\nwhich is tentatively identified as the host of GRB 050509b.  We measure a\nredshift of z=0.226 based on Ca H and K absorption and numerous other\nabsorption features. We do not detect any significant emission at Hbeta,\nHalpha or [O II].  The spectral features are consistent with an early\ntype galaxy with no ongoing star formation. If the association is\nconfirmed, this would be the first GRB host that is an early-type, hinting\nthat GRBs of short duration may be due to progenitors that are unrelated\nto current and on-going star formation.\n\nThis notice may be cited.\"",
  "circularId": 3390,
  "createdOn": 1115630531000,
  "email": "jbloom@cfa.harvard.edu",
  "subject": "Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b",
  "submitter": "Josh Bloom at Harvard/CFA  <jbloom@cfa.harvard.edu>",
  "eventId": "GRB 050509B"
}