{
  "bibcode": "2015GCN.18295....1P",
  "body": "D. A. Perley (DARK) and S. B. Cenko (NASA/GSFC) report:\n\nWe observed the location of GRB 150910A (Pagani et al., GCN 18264) using \nthe robotic Palomar 60-inch telescope on two epochs during the night of \n2015-09-11 UT, and an additional epoch during the night of 2015-09-12 \nUT.  During each epoch we acquired 3x180s of imaging in each of the g', \nr', and i' filters.\n\nThe optical afterglow (Pagani et al.; Zheng and Filippenko, GCN 18265) \nis detected in each observation.  Preliminary photometry relative to \nSDSS yields:\n\nt_start(d)  filt   mag      emag\n    0.973    i  =  21.24 +/- 0.12\n    0.980    g  =  21.54 +/- 0.06\n    0.989    r  =  21.35 +/- 0.08\n    1.067    i  =  21.28 +/- 0.07\n    1.074    g  =  21.85 +/- 0.06\n    1.081    r  =  21.50 +/- 0.06\n    2.060    i  =  22.21 +/- 0.17\n    2.067    g  =  22.66 +/- 0.14\n    2.074    r  =  23.03 +/- 0.26",
  "circularId": 18295,
  "createdOn": 1442074510000,
  "email": "dperley@astro.caltech.edu",
  "subject": "GRB150910A: P60 Observations",
  "submitter": "Daniel Perley at Caltech  <dperley@astro.caltech.edu>",
  "eventId": "GRB 150910A"
}