{
  "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 130606A (Ukwatta, et al., GCN 14781) 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 2013/06 8.18 to 2013/06 8.46 UTC (31.14 to\n37.86 hours after the BAT trigger), obtaining a total of 4.96 hours\nexposure in the r' and i' bands and 2.07 hours exposure in the Z, Y, J, and\nH bands.\n\nThe optical/NIR afterglow (Jelinek, et al., GCN 14782; Xu et al., GCN\n14783) is well detected.   In comparison with SDSS DR9 and 2MASS, we obtain\nthe following detections and 3-sigma upper limit:\n\n r'  >24.06\n i'  24.06 +/- 0.27\n Z   21.50 +/- 0.09\n Y   21.41 +/- 0.12\n J   21.16 +/- 0.12\n H   20.78 +/- 0.12\n\nThese magnitudes are in the AB system and not corrected for Galactic\nextinction in the direction of the GRB.  In comparison to our observations\non the previous night (2013/06/07; Butler, et al., GCN 14799), the\nafterglow has faded by about 3 magnitudes in all bands.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir.",
  "version": 2,
  "submitter": "Nat Butler at UC berkeley  <natxbutler@gmail.com>",
  "format": "text/plain",
  "email": "natxbutler@gmail.com",
  "circularId": 14824,
  "bibcode": "2013GCN.14824....1B",
  "editedOn": 1731005927781,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>",
  "subject": "GRB 130606A: Continued RATIR Optical and NIR Monitoring",
  "createdOn": 1370699691000,
  "eventId": "GRB 130606A"
}