{
  "bibcode": "2007GCN..6872....1P",
  "body": "D. A. Perley, J. S. Bloom, M. Modjaz, and D. Poznanski (UC Berkeley)  \nreport:\n\n\"In addition to the spectroscopic followup reported by Prochaska et  \nal. (GCN 6864), we acquired imaging of the GRB 071010A field in g and  \nR band with the Keck I 10m telescope (+LRIS) starting in twilight and  \ncontinuing until the object set.  The fading afterglow reported by  \nKlotz et al. (GCN 6860) is well-detected.\n\nPhotometry, calculated relative to the USNO B1.0 catalog, is as follows:\n\n   t_start(min)         R       err\n      67.497      18.025 +/- 0.03\n      71.041      18.080 +/- 0.03\n     189.225     18.784 +/- 0.02\n     194.482     18.806 +/- 0.02\n     199.457     18.827 +/- 0.02\n     201.544     18.846 +/- 0.02\n     203.794     18.873 +/- 0.02\n\nThis photometry supersedes the preliminary report in GCN 6861 (Bloom  \net al.). In addition, starting at 213 minutes after the trigger we  \nobtained a rapid series of 26 simultaneous g+R integrations of  \ntypically 30 sec duration, lasting until 239 minutes after the  \ntrigger.  Analysis is ongoing.\"\n\nThis message may be cited.",
  "circularId": 6872,
  "createdOn": 1192050997000,
  "email": "jbloom@astron.berkeley.edu",
  "subject": "GRB 071010A: Keck/LRIS Photometry",
  "submitter": "Josh Bloom at UC Berkeley  <jbloom@astron.berkeley.edu>",
  "eventId": "GRB 071010A"
}