{
  "bibcode": "2012GCN.13862....1F",
  "body": "J. P. U. Fynbo (DARK/NBI), D. Malesani (DARK/NBI), D. Xu (WIS), report \non behalf of a larger collaboration:\n\nWe performed a careful analysis of the spectrum secured at the NOT \n(Fynbo et al., GCN 13856) of the afterglow of GRB 121011A (Racusin et \nal., GCN 13845). We confirm that a faint continuum is visible in our \ndata, but we cannot detect any clear feature with confidence. The \nredshift z = 0.58 suggested in GCN 13856 is therefore not correct.\n\nA sharp break is detected at the blue end of our spectrum around 4100 \nAA, but its interpretation is not straightforward. If due to Ly alpha at \nz = 2.3, than we would expect surviving flux blueward of the break. If \ndue to the Lyman limit at z = 3.4, than we would expect to see the Lyman \nforest redward of the break, which we do not. We thus believe this break \nto be an artifact of the data, but encourage other observers to attempt \nspectroscopy with large area telescopes, also given the detection of the \nGRB by Fermi/LAT (Ohno et al., GCN 13859).",
  "circularId": 13862,
  "createdOn": 1350033633000,
  "email": "malesani@dark-cosmology.dk",
  "subject": "GRB 121011A: NOT redshift retraction",
  "submitter": "Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani@dark-cosmology.dk>",
  "eventId": "GRB 121011A"
}