{
  "bibcode": "2001GCN..1090....1A",
  "body": "V. Afanasiev, T. Fatkhullin, S. Dodonov, V. Sokolov, (SAO RAS),\nA. Castro-Tirado (IAA-CSIC Granada; LAEFF-INTA, Madrid), V. Komarova,\nA. Moiseev (SAO RAS), A. Cherepashchuk, K. Postnov (SAI-MSU Moscow)\nreport:\n\n\"On July 24, 2001 UT, we observed the field of GRB 001109 (Gandolfi, GCNs #878,\n#879). The photometric conditions were good with a seeing of about 1.3 arcsec. \nWe have obtained three 180-s R-band images with the SCORPIO instrument\n(http://www.sao.ru/~moisav/scorpio/scorpio.html) at the 6-m telescope of SAO\nRAS. At the position of the VLA radiosource (Taylor et al. GCN #880) which\nis presumably a radio afteglow (Rol et al. GCN #889) we detected an extended\nobject as already reported by Vreeswijk et al. (GCN #886) and Greiner et al. \n(GCN#887), most likely double. Spectroscopic observations (12 x 600-s \nexposures) were obtained with the 300 lines/mm grating giving a spectral \nresolution (FWHM) of about 20 A and an effective wavelength coverage of \n3500 - 9500 A. The slit was placed along the extended object. The analysis \nrevealed that the object is double with a spectra showing the continua\nwith clearly detected Balmer break. The redshift for each component is:\n\nObject A:  z = 0.398 +/- 0.002, based on identification of the Halfa 6563A,\n           O[III] 4959,5007AA emission lines (brighter component)\n\n\nObject B:  z = 0.3399 +/- 0.0005, based on identification of the Halfa 6563A,\n           Hbeta 4861AA, emission lines (fainter component)\n\nIf the radio transient is related to GRB 001109 indeed, then this is the\nnearest host galaxy detected so far.\n\nThe R-band image can be seen at:\nhttp://www.sao.ru/~sokolov/GRB/HOSTS/GRB001109/GRB001109.html\n\nThis message may be cited\".\n\n-Vladimir Sokolov, on behalf of the RAS Special Astrophysical Observatory\nGRB followup team.",
  "circularId": 1090,
  "createdOn": 999934127000,
  "email": "sokolov@sao.ru",
  "subject": "GRB001109, Host Galaxy Spectroscopic Observations",
  "submitter": "Vladimir Sokolov at SAO RAS  <sokolov@sao.ru>",
  "eventId": "GRB 001109"
}