{
  "bibcode": "2011GCN.11608....1T",
  "body": "N. R. Tanvir, K. Wiersema (U. Leicester), A. J. Levan (U. Warwick),\nA. Kamble (U. Wisconsin), A. Cardwell (ING) and E. M. Ratti (SRON)\nreport on behalf of a larger collaboration:\n\nWe obtained spectroscopy of the afterglow of GRB 110128A (GCN 11603,\nGCN 11605) and of two field galaxies nearby, using the 4.2 William Herschel\nTelescope on La Palma.�� Observations began at 04:26 UT, approximately 2.7 hours\npost-burst, and comprised a 60 minute total exposure. The spectra cover a\nwavelength range from about 4500A to 9400A.\n\nThe signal-to-noise, of the afterglow spectrum is not sufficient to confirm the\nredshift reported in Sparre et al. in GCN 11607 (and note, our spectral range\ndid not cover the DLA feature), however we did measure the redshifts of\ntwo field galaxies which are sufficiently close to the line of sight that they\nmight produce absorption in the afterglow:\n\nGal 1: RA=12:55:35.38, dec=+28:03:57.6\nz=0.639 based on [OII]3727, CaII H & K, Hbeta\nOffset from afterglow=5 arcsec, corresponding to ~35 kpc impact parameter to GRB\n\nGal 2: RA=12:55:36.40, dec=+28:04:12.1\nz=0.109 based on Ha and [NII]\nOffset from afterglow=25 arcsec, corresponding to ~50 kpc impact parameter to GRB",
  "circularId": 11608,
  "createdOn": 1296224508000,
  "email": "nrt3@star.le.ac.uk",
  "subject": "GRB 110128A: WHT redshifts of nearby field galaxies",
  "submitter": "Nial Tanvir at U.Leicester  <nrt3@star.le.ac.uk>",
  "eventId": "GRB 110128A"
}