{
  "bibcode": "2010GCN.10910....1U",
  "body": "A. Updike (Clemson University), M. Nardini, P. Afonso, A. Rau, T.\nKruehler, and J. Greiner (all MPE Garching) report on behalf of the\nGROND team:\n\nWe observed the field of GRB 100628A (Immler et al., GCN 10895)\nsimultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120,\n405) mounted at the 2.2 m MPI/ESO telescope at La Silla\nObservatory (Chile).\n\nObservations started at 01:24 UT on June 29, 17.1 hours after the GRB\ntrigger, and continued for 1.5 hours.\n\nIn stacked images of 75 min total integration time in g'r'i'z' and 60\nminutes in JHK we detect the possible host galaxy candidate G1 first\nnoted in Berger et al., GCN #10902 and Berger, GCN #10908 inside the\nrefined XRT position (Starling et al. GCN 10907) in all filters.\n\nPreliminary photometry yields the following AB magnitudes:\n\ng' = 22.8 +- 0.2\nr' = 21.5 +- 0.1\ni' = 20.6 +- 0.1\nz' = 20.0 +- 0.1\nJ  = 19.4 +- 0.1\nH  = 19.0 +- 0.1\nK  = 18.6 +- 0.1\n\ncalibrated against the GROND zeropoints and 2MASS field stars, and\nuncorrected for the expected mild foreground reddening in the direction\nof the burst of E(B-V) = 0.17 (Schlegel et al. 1998).\n\nGalaxy spectral template fitting using the publically available Lephare\ncode (Arnouts & Ilbert 2009,\nhttp://www.cfht.hawaii.edu/~arnouts/LEPHARE/cfht_lephare/lephare.html)\nprovides good fits of this very red spectral energy distribution with\nstarburst or late type galaxies. In this interpretation, a photometric\nredshift of z=0.67 (+0.34, -0.12) is indicated. We caution that the error\nmight be underestimated due to the missing photometric calibration in the\ng'r'i'z' bands. We note, however, that at this redshift the absolute\nmagnitude would be rather bright, M_B ~ -22 mag.",
  "circularId": 10910,
  "createdOn": 1277849087000,
  "email": "aupdike@clemson.edu",
  "subject": "GRB 100628A: GROND optical/NIR observations of the host candidate",
  "submitter": "Adria C. Updike at Clemson U  <aupdike@clemson.edu>",
  "eventId": "GRB 100628A"
}