{
  "bibcode": "2013GCN.14313....1S",
  "body": "L. P. Singer (Caltech), S. B. Cenko (UC Berkeley), and D. A. Brown\n(Syracuse) report on behalf of a larger collaboration:\n\nWe have imaged the 3-sigma Swift XRT error circle (D. Malesani, GCN\n14263) of GRB130305A (Fermi384176354, J. R. Cummings, GCN 14257) with\nthe Palomar 48 inch Oschin telescope (P48) as part of the Palomar\nTransient Factory (PTF).  Images were obtained in the Mould R filter\nat 2013-03-06 at 05:13:35 and 05:56:17 UTC, 17.6 and 18.3 hours after\nthe trigger.\n\nWe find no point source, fading or otherwise, to 5-sigma limiting\nmagnitudes of 20.8 and 20.8.",
  "circularId": 14313,
  "createdOn": 1363375712000,
  "email": "lsinger@caltech.edu",
  "subject": "GRB 130305A: PTF P48 optical upper limits",
  "submitter": "Leo Singer at CIT/PTF  <lsinger@caltech.edu>",
  "eventId": "GRB 130305A"
}