{
  "bibcode": "2007GCN..6997....1J",
  "body": "Pall Jakobsson (U. Hertfordshire), Daniele Malesani, \nJohan P. U. Fynbo, Jens Hjorth, Paul M. Vreeswijk \n(DARK, NBI) and Nial R. Tanvir (U. Leicester) report \non behalf of a larger collaboration:\n\nUsing FORS1 on the Very Large Telescope, we obtained \n2*20 min spectra (grism 300V+GG375 covering 4000-8000 A) \nof the GRB 060602A host galaxy on 28 December 2006. A firm \nupper limit of z < 2.3 can be placed on the host redshift \nfrom the lack of Ly-alpha forest lines in the combined \nspectrum.\n\nWe do detect a strong emission line at 6664 A. If it \ncorresponds to H-alpha at z = 0.015, we would expect to \ndetect H-beta and the [O III] doublet in our spectrum. \nHowever, no features are visible at their predicted \nlocations. In addition, this redshift would imply a very \nfaint absolute magnitude of M_R = -10.3.\n\nIf the emission line corresponds to [O III] 5008 at \nz = 0.331, we would expect to detect [O II] 3728 which we \ndo not. The most probable association is with [O II] 3728, \ncorresponding to a redshift of z = 0.787. \n\nUsing the relations by Kennicutt (1998, ARA&A, 36, 189), \nthe flux of the proposed [O II] line corresponds to a star \nformation rate (SFR) of approximately 1.9 M_Sun/year. This \nvalue has not been corrected for host extinction, and is \ntherefore a strict lower limit to the actual SFR. The \nspecific SFR is around 13.6 M_Sun/year (L/L*)^-1, typical \nfor GRB host galaxies (Christensen et al., 2004, A&A, 425, 913).",
  "circularId": 6997,
  "createdOn": 1193316259000,
  "email": "P.Jakobsson@herts.ac.uk",
  "subject": "GRB 060602A: host redshift",
  "submitter": "Pall Jakobsson at U Hertfordshire  <P.Jakobsson@herts.ac.uk>",
  "eventId": "GRB 060602A"
}