{
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>",
  "email": "natbutler@asu.edu",
  "eventId": "GRB 130831A",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "body": "Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William\nH. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB),\nJ. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC),\nEleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC),\nJosé A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM),\nCarlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC)\nreport:\n\nWe observed the field of GRB 130831A (Hagen, et al., GCN 15139) with the\nReionization and Transients Infrared Camera (RATIR; www.ratir.org) on the\n1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on\nSierra San Pedro Mártir from 2013/09 1.16 to 2013/09 1.49 UTC (14.65 to\n22.73 hours after the BAT trigger), obtaining a total of 5.16 hours\nexposure in the r' and i' bands and 2.09 hours exposure in the Z, Y, J, and\nH bands.\n\nFor a source within the Swift-XRT error circle (Evans et al., GCN 15147),\nin comparison with SDSS DR9 and 2MASS, we obtain the following detections:\n\n  r'    20.64 +/- 0.03\n  i'    20.38 +/- 0.03\n  Z    20.20 +/- 0.07\n  Y    19.69 +/- 0.07\n  J    19.87 +/- 0.09\n  H    19.88 +/- 0.14\n\nThese magnitudes are in the AB system and not corrected for Galactic\nextinction in the direction of the GRB.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San\nPedro Mártir.",
  "createdOn": 1378090338000,
  "editedOn": 1731005786073,
  "format": "text/plain",
  "subject": "GRB 130831A: RATIR Optical and NIR Observations",
  "version": 2,
  "circularId": 15165,
  "bibcode": "2013GCN.15165....1B"
}