{
  "bibcode": "2018GCN.22484....1S",
  "body": "B. Sbarufatti (INAF/Brera PSU), J. Bolmer (MPE), A. De Ugarte Postigo \n(IAA/CSIC and DARK/NBI), J. P. U. Fynbo (DAWN/NBI), J. Selsing \n(DARK/NBI), K. E. Heintz (Univ. Iceland and DAWN/NBI), D. Malesani \n(DAWN/NBI and DARK/NBI), N. R. Tanvir (Univ. Leicester), A. J. Levan \n(Univ. Warwick), A. Smette (ESO), K. Wiersema (Univ. Warwick), S. Covino \n(INAF/Brera), report on behalf of the Stargate collaboration:\n\nWe observed the optical counterpart of GRB 180314A (D'Avanzo et al., GCN \n22478; Bolmer, GCN 22479) with the ESO/VLT UT2 equipped with the \nX-shooter spectrograph. Observations started on Mar 14.067 UT (53.3 min \nafter the GRB) and covered the wavelength range 3000-20000 AA. In our \nacquisition image, we measure for the afterglow r = 18.87 +- 0.05 AB, \ncalibrated to the Pan-STARRS catalog. The afterglow position is RA = \n06:37:03.66, Dec = -24:29:46.2, consistent with the UVOT position \n(D'Avanzo et al., GCN 22478).\n\nA high-S/N continuum is detected in all arms (reaching ~3100 AA in the \nblue end). We identify several absorption features, including Mg II, Zn \nII, Al II, Al III, Cr II, Fe II at a common redshift z = 1.445. We also \ndetect at least one Fe II* fine-structure line at the same redshift, \nthus confirming the association of this system with GRB 180314A.\n\nWe acknowledge excellent support from the observing staff in Paranal, in \nparticular Boris Haeussler and Zahed Wahhaj.",
  "circularId": 22484,
  "createdOn": 1521030447000,
  "email": "malesani@dark-cosmology.dk",
  "subject": "GRB 180314A: VLT/X-shooter redshift",
  "submitter": "Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani@dark-cosmology.dk>",
  "eventId": "GRB 180314A"
}