{
  "bibcode": "2012GCN.13890....1T",
  "body": "N. R. Tanvir (U. Leicester), J. P. U. Fynbo (DARK/NBI), A. Melandri (INAF-OAB), \nA. J. Levan (U. Warwick), D. Xu (WIS), V. D'Elia (ASDC) report on behalf of \nthe X-shooter GTO collaboration:\n\nWe observed the afterglow of GRB 121024A (Pagani et al. GCN 13886) with the\nX-shooter spectrograph at the VLT. Observations began at 04:45 UT, approximately\n1.8 hours after the initial detection of the burst. The afterglow is well detected in\nthe acquisition image, and in the resulting spectrum we see a strong, broad \ndamped-Lya absorption feature at ~4000A, combined with numerous narrow metal \nlines of CIV, SiII, SiIV, FeII, SII and AlII, as well as fine-structure lines associated \nwith SiII*. These point to a common redshift of z=2.298 for GRB 121024A.\n\nWe thank Maja Vuckovic, Giovanni Carraro, Marcelo Lopez and Felipe Gaete\nfor their assistance in obtaining these observations, and Gianni Marconi\nand Gerry Gilmore for kindly allowing the ToO to be performed during their\nvisitor mode run.",
  "circularId": 13890,
  "createdOn": 1351062659000,
  "email": "nrt3@star.le.ac.uk",
  "subject": "GRB 121024A: VLT/X-shooter redshift",
  "submitter": "Nial Tanvir at U.Leicester  <nrt3@star.le.ac.uk>",
  "eventId": "GRB 121024A"
}