{
  "bibcode": "2010GCN.11123....1T",
  "body": "N. R. Tanvir (U. Leicester), S. Vergani (GEPI/Obs. Paris and APC/Univ. Paris 7),\nJ. Hjorth, J. P. U. Fynbo, B. Milvang-Jensen, D. Malesani (DARK),\nK. Wiersema (U. Leicester),�� P. Vreeswijk (Reykjavik), A. J. Levan (U. Warwick)\nP. Goldoni (APC/Univ. Paris 7 and SAp/CEA), S. Covino (INAF/Brera), & L. A. Antonelli (INAF/Roma)\nreport on behalf of a larger collaboration:\n\nWe observed the location of possible short-hard GRB 100816A\n(Oates et al. GCN 11102; Markwardt et al. GCN 11111; Norris et al. GCN 11116)\nwith VLT/X-Shooter on 2010 Aug 17 beginning 04:20 (UT).�� We clearly\ndetect the putative host galaxy of the burst, and identify lines of Halpha,\nHbeta,�� OII (3727), NII (6548/6583) and OIII (5007) in emission and CaII H&K\nin absorption.�� In fact, the system splits (spectrally and spatially) into two\ncomponents at redshifts z=0.8034 and z=0.8049 (based on a provisional\nwavelength calibration), possibly indicating an interacting system or reflecting\ninternal velocity components within a single galaxy.�� This redshift is inconsistent\nwith the tentative redshift for this galaxy suggested by Tanvir et al. (GCN 11116).\n\nWe have also re-analysed the Gemini-N GMOS afterglow spectroscopy initially\nreported in GCN 11116.�� The trace shows faint absorption features\nconsistent with MgII (2797/2803A) doublet and FeII (2600A) at a redshift of\nz=0.8035. The agreement of this redshift with that obtained for the galaxy from\nthe X-shooter data, strongly suggests that it is the host.�� We note that none of\nthe emission lines seen in the X-Shooter spectrum are within the spectral range\nof the GMOS data.\n\nWe acknowledge the support of the VLT staff, in particular Giovanni Carraro.\n\n[GCN OPS NOTE(19aug10): Per author's request, LAT was added to the author list.]",
  "circularId": 11123,
  "createdOn": 1282049780000,
  "email": "nrt3@star.le.ac.uk",
  "subject": "GRB 100816A: VLT and Gemini-N revised redshift",
  "submitter": "Nial Tanvir at U.Leicester  <nrt3@star.le.ac.uk>",
  "eventId": "GRB 100816A"
}