{
  "bibcode": "2014GCN.16217....1F",
  "body": "J. P. U. Fynbo (DARK/NBI), N. R. Tanvir (U. Leicester), P. Jakobsson\n(U. Iceland), D. Xu, D. Malesani, B. Milvang-Jensen  (DARK/NBI) report\non behalf of the X-shooter GRB collaboration:\n\nWe observed the optical afterglow of GRB 140506A (Gompertz et al., GCN\n16214) with the VLT/X-shooter spectrograph, equipped with the\nUVB/VIS/NIR arms and covering the wavelength range 3000-25000 AA.\n\nFrom the first acquisition image at May 7.21 UT, the afterglow has\nm(R)=20.9 +/- 0.2 mag against the USNO-B1 (R2) catalog.\n\nThe spectra (8 x 600 s) started at May 7.21 UT and ended May 7.28 UT,\nand the mean time is May 7.24 UT (8.77 hr after the GRB). We detect\nabsorption features in the UVB/VIS arms, interpreted as due to Mg II\n2796, 2803, He I 3889, and Ca II H+K, at a common redshift of z =\n0.889, which is treated as the tentative redshift of the GRB's host\ngalaxy. The combined spectrum is very red with very weak signal in the\nUVB arm, possibly due to the large host extinction.\n\nWe acknowledge excellent support from the observing staff at Paranal,\nin particular Valentin D. Ivanov and Yazan Momany.",
  "circularId": 16217,
  "createdOn": 1399457193000,
  "email": "dong.dark@gmail.com",
  "subject": "GRB 140506A: VLT/X-shooter spectroscopy",
  "submitter": "Dong Xu at DARK/NBI  <dong.dark@gmail.com>",
  "eventId": "GRB 140506A"
}