{
  "bibcode": "2017GCN.20655....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 170208B (Siegel, et al., GCN 20632) 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 9.11 to 2017/02 9.47 UTC (3.98 to\n12.65 hours after the BAT trigger), obtaining a total of 6.02 hours\nexposure in the r and i bands and 2.52 hours exposure in the Z and Y bands.\n\nWe do not detect either the GROND (Kruehler, et al., GCN 20640) source or\nthe WHT (Wiersema, et al., GCN 20647) source.  In comparison with the\nUSNO-B1 and 2MASS catalogs, we obtain the following upper limits (3-sigma):\n\nr > 23.56\ni > 23.43\nZ > 22.64\nY > 22.55\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.  The lack of detection of the WHT\nsource is consistent with this source being reddened due to dust or due to\na high-z origin if the GROND source is not the GRB host galaxy.  The first\npossibility is also suggested by the significant X-ray column density\nrelative to the Galactic value (Kennea, et al., GCN 20637).\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 20655,
  "createdOn": 1486684126000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 170208B: RATIR Optical and NIR Observations",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 170208B"
}