{
  "bibcode": "2013GCN.14846....1C",
  "body": "S. B. Cenko (NASA/GSFC) and D. A. Perley (Caltech) report on behalf of a\nlarger collaboration:\n\nWe have imaged the optical afterglow of the Swift GRB 130610A (Cummings et\nal., GCN 14842) with the robotic Palomar 60 inch telescope.  A series of\n90 s exposures in the g', r', i', and z' filters were begun starting at\n04:23 UT on 2013 Jun 10 (1.18 hr after the Swift trigger).  We detect the\nafterglow in individual exposures in all 4 filters.  Using nearby point\nsources from SDSS for calibration, we measure a magnitude of r' = 19.8 in\nour initial images.  Compared with earlier observations with the Liverpool\ntelescope (Melandri et al., GCN 14843), this suggests a power-law decay\nindex of ~ 1.2.",
  "circularId": 14846,
  "createdOn": 1370841552000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 130610A: P60 Observations",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 130610A"
}