{
  "bibcode": "2012GCN.13695....1C",
  "body": "S. B. Cenko (UC Berkeley), E. O. Ofek (Weizmann Institute) and D. B.\nFox (Penn State) report on behalf of a larger collaboration:\n\nWe have imaged the field of the IPN short-hard GRB120817B (Golenetskii et\nal., GCN 13670) with the Palomar 48 inch Oschin telescope (P48) as part of\nthe Palomar Transient Factory (PTF).  Images were obtained in the Mould R\nfilter on 2012 Aug 19.4 and 20.4 UT.\n\nInside the error localization derived from ground-based analysis of the\nSwift BAT (Cummings et al., GCN 13692), we find no new sources when\ncompared with Digitized Sky Survey images of the field on either night.\nDigitally subtracting coadded frames from the two nights, we find no\nfading sources within the field to a limiting magnitude of R > 20.5\n(calibrated with respect to field stars from the USNO-B1 catalog).\n\nFinally, we note that the error circle does not appear to contain any\nbright, resolved (i.e. nearby) galaxies.  No known galaxies are listed in\nthe NASA Extragalactic Database within 5 arcmin of the center of the Swift\nBAT localization.\n\n[GCN OPS NOTE(22aug12):  Per author's request, \"120718B\" in the Subject-line\nwas changed to \"120817B\".]",
  "circularId": 13695,
  "createdOn": 1345525984000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 120817B - PTF Observations",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 120817B"
}