{
  "bibcode": "2022GCN.32291....1I",
  "body": "L. Izzo (DARK/NBI), V. D'Elia (ASI/SSDC, INAF/OAR), A. de Ugarte Postigo \n(OCA), J. P. U. Fynbo (DAWN/NBI), D. A. Kann (IAA-CSIC), A. J. Levan \n(Radboud Univ.), D. B. Malesani (Radboud Univ. and DAWN/NBI), A. \nSaccardi (GEPI/Paris Obs.), C. C. Thoene (ASU-CAS), J. F. Agui Fernandez \n(IAA-CSIC), S. de Wet (UCT), P. J. Groot (Radboud Univ., UCT, SAAO), \nreport on behalf of the Stargate consortium:\n\nWe observed the candidate optical afterglow (de Wet et al., GCN 32289) \nof the Fermi GBM and LAT GRB 220627A (Roberts et al., GCN 32288; Di \nLalla et al., GCN 32283) using the ESO VLT equipped with the MUSE \nintegral-field spectrograph. Observations were carried out starting on \n2022 June 29.06 UT (1.17 days after the trigger), and cover the \nwavelength range 4800-9300 AA.\n\nA broad trough is detected centered around 4960 AA, which we interpret \nas due to DLA HI absorption. A number of metal lines are also detected, \nwhich we identify as, among others, O I, O I*, Si II, Si II*, C II, C \nII*, Si IV, C IV, Al II, at a common redshift z = 3.084. We also note \nthe presence of a (rich) intervening system at z = 2.665 (as identified \nby, e.g., S IV, Si II, C IV, Fe II, Al II).\n\nThe redshift and luminosity of this object, together with its X-ray \nemission (Evans et al., GCN 32284), make it very likely to be the \nafterglow of GRB 220627A. Using the preliminary GBM fluence and spectral \nparameters (Roberts et al., GCN 32288), we derive an \nisotropic-equivalent quasi-bolometric gamma-ray energy of 3.6*10^54 erg \n(0.1 keV - 100 MeV rest frame).\n\nWe thank the ESO staff at Paranal for carrying out or observations, in \nparticular Jonathan Smoker, Camila Navarrete, Rodrigo Palominos, and \nMarco Berton.",
  "circularId": 32291,
  "createdOn": 1656507984000,
  "email": "d.malesani@astro.ru.nl",
  "subject": "GRB 220627A: VLT MUSE redshift",
  "submitter": "Daniele B Malesani at Radboud U  <d.malesani@astro.ru.nl>",
  "eventId": "GRB 220627A"
}