{
  "bibcode": "2003GCN..2475....1P",
  "body": "J.X. Prochaska (UCO/Lick Observatory), H.W. Chen (MIT),\nK. Hurley (UCB), J.S. Bloom (Harvard/CfA), J.R. Graham (UCB),\nand W.D. Vacca (NASA/Ames) report:\n\n\nUsing SCAM with the NIRSPEC instrument on the KeckII telescope,\nwe imaged the ~50\"x50\" region surrounding GRB031203 (Gotz et al., GCN 2459).\nWe acquired exposures in the N3 (~J; 540s), N5 (~H; 360s), and\nK' (540s) bands with approximately 0.5\" seeing in photometric conditions.\n\nWithin the 6\" XMM error circle, we identify 2 objects:\n\n(1) A point source at RA=08:02:29  DEC=-39:51:09 (ANDICAM 1)\n(2) A galaxy at RA=08:02:29  DEC=-39:51:12\n\nThe latter object nearly coincides with the VLA position of the radio\nsource in the XMM error box (Frail, priv. communication).\nWe believe the GRB event occurred within this galaxy.\n\nThe observed K'-band magnitude of the galaxy is 16.5 +/- 0.05\nAdopting an extinction E(B-V)=0.97, we estimate a corrected\nK'-band luminosity K'=16.15 mag.  The galaxy also has an\nellipticity E=0.23 and PA=-8 deg.\n\nFinally, adopting K'(M*) = -23.3 from the 2MASS survey (Bell et al. 2003),\nwe note an M* galaxy at z=0.17 would have K'=16.15 assuming an LCDM\ncosmology and no evolution in the stellar population.\n\nWe also identify a ~5sigma object 1.4\"N and 0.2E\" of the galaxy center\nwith observed K' magnitude of 21.1 +/- 0.2.  This tentative detection\nlies within 0.5\" of the VLA position.\n\nNo object was observed in our images at the position of\nthe REM source (Zerbi et al., GCN 2466) to K'<21.5 mag.\n\nMore details can be found here:\n\nhttp://www.ucolick.org/~xavier/GRB/031203/index.html\n\nThis message may be cited.",
  "circularId": 2475,
  "createdOn": 1070719224000,
  "email": "khurley@sunspot.ssl.berkeley.edu",
  "subject": "GRB031203: K' Photometry of the likely GRB host",
  "submitter": "Kevin Hurley at UCBerkeley/SSL  <khurley@sunspot.ssl.berkeley.edu>",
  "eventId": "GRB 031203"
}