{
  "bibcode": "2007GCN..6741....1T",
  "body": "C. C. Thoene (DARK, UC Berkeley), D. A. Perley (UCB), J. Cooke (UC\nIrvine), J. S. Bloom (UC Berkeley), H.-W. Chen (Univ. Chicago) and E.\nBarton (UCI) report:\n\nWe took 2x10min spectra of the afterglow of GRB 070810 (GCN 6734, Swan et\nal.; GCN 6735, Chester et al.) with Keck I + LRIS on Aug. 10, starting\n05:46:32 UT (3.58h after the burst) in twilight. From a DLA and several\nabsorption lines including Fe II, OI, SiII and CII, we infer a redshift of\nz=2.17 for that burst.\n\nIn addition, we obtained 2x120 s imaging in R band and 2x150 s in g band,\nstarting at 06:13:26 UT.\nCalibrating relative to five USNO-B1.0 stars, we measure a magnitude of\nR=20.45 +/- 0.5, dominated by the systematic uncertainty relative to the\ncatalog.",
  "circularId": 6741,
  "createdOn": 1186753634000,
  "email": "cthoene@astro.ku.dk",
  "subject": "GRB 070810: Keck redshift and photometry",
  "submitter": "Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr  <cthoene@astro.ku.dk>",
  "eventId": "GRB 070810"
}