{
  "bibcode": "2017GCN.20595....1B",
  "body": "Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William\nH. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier\nProchaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora\nTroja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes��s\nGonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Neil Gehrels (GSFC), Harvey\nMoseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy\n(UMD) report:\n\nWe observed the field of GRB 170202A (Racusin, et al., GCN 20575) with the\nReionization and Transients Infrared Camera (RATIR; www.ratir.org) on the\n1.5m Harold Johnson Telescope at the Observatorio Astron��mico Nacional on\nSierra San Pedro M��rtir from 2017/02 3.18 to 2017/02 3.57 UTC (9.92 to\n19.17 hours after the BAT trigger), obtaining a total of 3.98 hours\nexposure in the r and i bands and 1.68 hours exposure in the Z and Y bands.\n\nFor a source within the Swift-XRT error circle (Osborne, et al., GCN\n20586), in comparison with the SDSS DR9 and 2MASS catalogs, we obtain the\nfollowing detections:\n\nr = 20.68 +/- 0.01\ni = 20.83 +/- 0.02\nZ = 20.84 +/- 0.07\nY = 20.50 +/- 0.06\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 20595,
  "createdOn": 1486140966000,
  "email": "natxbutler@gmail.com",
  "subject": "GRB 170202A: RATIR Optical and NIR Observations",
  "submitter": "Nat Butler at UC berkeley  <natxbutler@gmail.com>",
  "eventId": "GRB 170202A"
}