{
  "bibcode": "2013GCN.15423....1P",
  "body": "D. A. Perley (Caltech) and S. B. Cenko (NASA/GSFC) report on behalf of a\nlarger collaboration:\n\nWe observed the afterglow of GRB 131030A (GCN 15402, Troja et al.) with \nthe robotic Palomar 60-inch telescope in the g, r, i, and z filters. \nThree exposures of 180 seconds each were acquired in each filter at four \nseparate epochs starting at 5.09, 6.63, 8.12, and 9.65 hours after the \nSwift trigger, respectively.  The light curve in these bands shows a \nsteady power-law decline with decay index alpha~0.95, similar to that \nreported by RATIR over the same timescale (GCN 15420, Littlejohns et al.)\n\nPhotometry from the first epoch (calibrated relative to SDSS) yields:\n\nt_mid(d) exp(s) filter   magnitude\n0.21434  3x180    g  = 19.14 +/- 0.02\n0.21912  3x180    r  = 18.81 +/- 0.02\n0.22391  3x180    i  = 18.61 +/- 0.03",
  "circularId": 15423,
  "createdOn": 1383266938000,
  "email": "dperley@astro.caltech.edu",
  "subject": "GRB 131030A: P60 observations",
  "submitter": "Daniel Perley at Caltech  <dperley@astro.caltech.edu>",
  "eventId": "GRB 131030A"
}