{
  "bibcode": "2003GCN..1910....1B",
  "body": "E. Berger, S. Kulkarni, A. Soderberg, and D. Fox (Caltech) report on\nbehalf of a larger GRB collaboration:\n\n\"We have re-imaged the field of GRB 030227 with ESI on the Keck II\ntelescope starting on Mar 1.25 UT.  In the 6\" localization of the XMM\nsource S1 (Loiseau et al. GCN 1901) we again detect the two sources S1-A\n(Castro-Tirado et al. GCN 1904;  Soderberg et al.  GCN 1907) and S1-B (GCN\n1907).  We find that source S1-A has continued to fade (as t^-1),\nconfirming it as the optical afterglow of GRB 0320227 as suggested by\nSoderberg et al. (GCN 1907).\n\nThe candidate of Ofek and Gal-Yam (GCN 1903) has remained constant between\nlast night and tonight with a magnitude of about 22.1.\"\n\nThis message may be cited.",
  "circularId": 1910,
  "createdOn": 1046501958000,
  "email": "ejb@astro.caltech.edu",
  "subject": "GRB 030227: Confirmed Optical Afterglow (S1-A)",
  "submitter": "Edo Berger at Caltech  <ejb@astro.caltech.edu>",
  "eventId": "GRB 030227"
}