{
  "bibcode": "2020GCN.29132....1D",
  "body": "A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), D. A. Kann \n(HETH/IAA-CSIC), L. Izzo (DARK/NBI), C.C. Thoene, M. Blazek, J. F. Agui \nFernandez (all HETH/IAA-CSIC) and G. Lombardi (GRANTECAN, IAC) report:\n\nWe obtained spectroscopy of the optical counterpart (Malesani et al., \nGCN #29117) of the short GRB 201221D (Page et al., GCN #29112) with \nOSIRIS at the 10.4m Gran Telescopio Canarias (Roque de los Muchachos \nObservatory, La Palma, Spain), starting at 1:52 UT (2.757 hr after the \nburst). The observation consisted of 4 x 1200 s exposures with the \nR1000B grism, covering the range between 3700 and 7800 Angstrom.\n\nThe spectrum shows a weak continuum over the full spectral range. There \nis a prominent emission feature that we identify as the [OII] 3727/3729 \ndoublet at a redshift of 1.046. This line happens to lie in the \natmospheric A band, and therefore must be quite strong to be detectable. \nThere are also low significance absorption featuress coincident with \nFeII and MgII at a similar redshift (z = 1.045). We identify this as the \nredshift of GRB 201221D. We note this is a high redshift for a short \nGRB, and it represents one of the few short GRB spectra to show \nafterglow absorption features.",
  "circularId": 29132,
  "createdOn": 1608648593000,
  "email": "kann@iaa.es",
  "subject": "Short GRB201221D: High Redshift from OSIRIS/GTC",
  "submitter": "Alexander Kann at IAA-CSIC  <kann@iaa.es>",
  "eventId": "GRB 201221D"
}