{
  "bibcode": "2007GCN..5996....1C",
  "body": "H.-W. Chen (U Chicago), J. Dembicky (APO), D. York, D. Lamb (U Chicago),\nR. McMillan, B. Ketzeback, and G. Saurage (APO) report on behalf of a\nlarger collaboration:\n\n\"We obtained 5x600 sec dithered exposures in each of the SDSS i' and\nz' bands of the field of GRB070103 (Sakamoto et al., GCN 5988), using\nthe SPIcam on the 3.5 m telescope at the Apache Point Observatory.  The\nobservations started at Jan 04.05 UT (~ 4.5 hrs after the initial\nSwift trigger) under photometric conditions with a mean seeing of 1.6-2\narcsec.  Calibrating the final stacks based on a SDSS standard field\nobserved through these filters gives 5-sigma depths of AB(i')=24.6 and\nAB(z')=24.0 over a 2-arcsec diameter aperture at the location of the\nx-ray source reported by Mangano et al. (GCN 5992). \"",
  "circularId": 5996,
  "createdOn": 1167962984000,
  "email": "hchen@oddjob.uchicago.edu",
  "subject": "GRB070103: APO SPIcam i' and z' limits",
  "submitter": "Hsiao-Wen Chen at U Chicago  <hchen@oddjob.uchicago.edu>",
  "eventId": "GRB 070103"
}