{
  "bibcode": "2016GCN.19274....1S",
  "body": "J. Selsing (DARK/NBI), P.M. Vreeswijk (WIS), J. Japelj (INAF/OATs), V. \nD'Elia (ASI/ASDC and INAF/Roma), A. de Ugarte Postigo (IAA/CSIC and \nDARK/NBI), G. Pugliese (API/UvA), D. Xu (NAOC/CAS), D. Malesani \n(DARK/NBI), T. Kruehler (MPE), J.P.U. Fynbo (DARK/NBI), report on behalf \nof a larger collaboration:\n\nWe observed the optical afterglow of GRB 160410A (Gibson et al., GCN \n19271; Yates et al., GCN 19272) with the ESO Very Large Telescope UT2 \n(Kueyen) equipped with X-shooter. Observations were triggered \nrobotically in \"rapid response mode\" (RRM). Our spectroscopic \nintegration started 8.4 min after the GRB and 3x600 s spectra were \ncollected covering the wavelength range 3000-24,500 AA, until the target \nbecame too low on the horizon.\n\nThe optical afterglow is detected in our acquisition image (7.7 min \nafter the GRB) with a magnitude r = 20.29 +- 0.06 (AB), calibrated \nagainst two nearby SDSS stars.\n\nOur spectra reveal continuum over the entire spectral range redward of \n~3400 AA, which constrains the redshift to be z < 1.8. Besides, a number \nof weak absorption features are detected, which we interpret as due to \nFe II and Al II at a redshift z = 1.717. At this redshift, the Mg II \n2796,2803 doublet lies into a region of strong telluric absorption (the \nA band) and is not detected. Two intervening C IV absorbers are also \nobserved at z = 1.444 and z = 1.581.\n\nWe acknowledge excellent and prompt support from the ESO staff at \nParanal, in particular Annalisa De Cia and Cedric Ledoux.",
  "circularId": 19274,
  "createdOn": 1460303403000,
  "email": "malesani@dark-cosmology.dk",
  "subject": "GRB 160410A: VLT/X-shooter redshift",
  "submitter": "Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani@dark-cosmology.dk>",
  "eventId": "GRB 160410A"
}