{
  "bibcode": "2005GCN..3801....1B",
  "body": "E. Berger (Carnegie Observatories) reports:\n\n\"We reduced and analyzed spectra of galaxies B and C in the XRT error\ncircle of GRB 050813 (GCN 3788) obtained on Aug 14.35 UT with GMOS on the\nGemini north telescope under program GN-2005B-Q-6.  Two 1800-sec exposures\nwere obtained with a 0.75\" slit using the R400 grating.  We find that both\ngalaxies exhibit clear Ca H&K, H-beta, and H-gamma absorption at a\nredshift of z=0.722.  The identical redshifts and the nature of the\ngalaxies (early types dominated by old stellar populations) support the\nconclusion of Gladders et al. (GCN 3798) from Magellan imaging that the\nposition of GRB 050813 is centered on a galaxy cluster at z~0.5-1.  At\nthis redshift, given K~19 mag, galaxies B and C are about 0.5 L* compared\nto the 2MASS luminosity function.\n\nAssuming that this is the redshift of GRB 050813, we find an isotropic\nequivalent gamma-ray energy of 1.7e50 erg (fluence = 1.24e-7 erg/cm^2;  \nGCN 3793), which is somewhat larger than that of GRB 050724.\"",
  "circularId": 3801,
  "createdOn": 1124050041000,
  "email": "eberger@ociw.edu",
  "subject": "GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C",
  "submitter": "Edo Berger at Carnegie Obs  <eberger@ociw.edu>",
  "eventId": "GRB 050813"
}