{
  "bibcode": "2007GCN..6018....1B",
  "body": "E. Berger (Carnegie Observatories) reports on behalf of a large \ncollaboration:\n\n\"We re-observed the position of GRB 050904 (z=6.295) with NICMOS on the \nHubble Space Telescope on 2006 July 22 UT.  A total of 6 orbits (15360 \nsec) were obtained with the F160W (H-band) filter.  Previous observations \nof the burst with NICMOS on 2005 Sep 27 UT revealed a source with \nF160W(AB)=26.1+/-0.2 mag (Berger et al. astro-ph/0603689), which was \ninterpreted as a combination of afterglow and host galaxy light.  The new \nobservations reveal no source at the position of the burst to a 3-sigma \nlimit of F160W(AB)=27.2 mag.  This result indicates that the host galaxy \nis fainter than about 0.05 microJy, and that the light contribution from \nthe afterglow to the source detected in the Sep 2005 observations was\n>60%, confirming the proposed jet break at t~3 days (Tagliaferri et al. \n2005; Haislip et al. 2006).\n\nA complete analysis of the new NICMOS observations, and their implications \nfor the afterglow and host galaxy properties, will be made available in a \nrevised version of astro-ph/0603689.\"",
  "circularId": 6018,
  "createdOn": 1169062908000,
  "email": "eberger@ociw.edu",
  "subject": "GRB 050904: Second Epoch of HST/NICMOS Observations",
  "submitter": "Edo Berger at Carnegie Obs  <eberger@ociw.edu>",
  "eventId": "GRB 050904"
}