{
  "bibcode": "2007GCN..6450....1C",
  "body": "S. B. Cenko (Caltech), P. A. Price (IfA/Hawaii), and E. Berger (OCIW)\nreport on behalf of a larger collaboration:\n\nWe have imaged the field of GRB070521 (Guidorzi et al.; GCN 6431) with the\nGemini Multi-Object Spectrograph (GMOS) and the Near-Infrared Imager\n(NIRI) mounted on the Gemini North Telescope.  Observations were taken in\nthe g', i', z' (GMOS) and J, H, Ks (NIRI) filters, beginning at 7:36:54\nUT on 21 May 2007.\n\nWe weakly detect the host candidate proposed by Hattori, Aoki, and Kawai\n(GCN 6444) only in our i'- and Ks-band images.  In the table below we\nreport a summary of our observations.  Photometric calibration was\nperformed relative to SDSS (Cool et al.; GCN 6432) for the GMOS images\nand the 2MASS point source catalog for our NIRI imaging.\n\nFilter\t\tt - t_b (hr)\tExposure (s)\tMagnitude\n-------------------------------------------------------------------------\ng'\t\t1.08\t\t2 x 180\t\t> 25.0\ni'\t\t1.21\t\t2 x 180\t\t~ 24.1\nz'\t\t1.33\t\t4 x 180\t\t> 23.0\nJ\t\t1.92\t\t15 x 30\t\t> 21.5\nH\t\t2.20\t\t15 x 30\t\t> 21.0\nKs\t\t2.50\t\t15 x 30\t\t~ 22.3",
  "circularId": 6450,
  "createdOn": 1179803633000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB070521: Gemini Observations",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 070521"
}