{
  "bibcode": "2011GCN.12763....1P",
  "body": "E. Palazzi (INAF-IASFBo), D. Fugazza (INAF-OAB), S. Piranomonte \n(INAF-OAR) on behalf of a larger collaboration report:\n\nThe afterglow of GRB 111228A (Ukwatta et al. GCN 12737) was observed \nwith the DOLORES instrument mounted at the Telescopio Nazionale Galileo \non La Palma, Canary Islands. Starting on December 29.1200 (~11 hour \nafter the burst), a series of three spectra of 1800s each were secured \nwith LR-B grism (range 3500-8000 Angstroms).\n\nPreliminary reduction of the spectra reveals absorption features that we \nidentify with the following absorption lines:\n\nLines ID       Lambda_observed\n              (Angstroms)\nFeII_2344.21   4019.83\nFeII_2374.46   4073.40\nFeII_2382.76   4088.32\nFeII_2585.65   4436.05\nFeII_2600.17   4460.64\nMgII_2795.50   4795.65\nMgII_2802.70   4808.58\nMgI_2852.96    4891.53\nCaII_3933.68   6756.61\nCaII_3968.49   6807.44\n\nThe derived redshift is z=0.7156 � 0.0005 which confirms the results \nobatined by Dittman et al. (GCN 12759) and Cucchiara et al (GCN 12761).\n\nIn addition to the GRB afterglow we observed the SDSS galaxy reported by \nGuver (GCN 12741). We detect many emission lines (OII_3726+3728, Hbeta, \nOIII_4958, OIII_5006, Halpha) at a common redshift of 0.218 � 0.001 \nwhich is in agreement with the reported photometric redshift. This \ngalaxy is therefore not related to the GRB.\n\nWe acknowledge the excellent support from the TNG staff, in particular \nWalter Boschin and Gianni Tessicini\n\n[GCN OPS NOTE(22jan12): Per author's request, the affilation was changed\nfrom \"U.Milano-Bicocca,INAF/Brera\" to \"INAF-OAB\".]",
  "circularId": 12763,
  "createdOn": 1325162206000,
  "email": "dino.fugazza@brera.inaf.it",
  "subject": "GRB111228A: TNG spectroscopy analysis",
  "submitter": "Dino Fugazza at INAF-OAB  <dino.fugazza@brera.inaf.it>",
  "eventId": "GRB 111228A"
}