{
  "bibcode": "2016GCN.18989....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 (GSFC/STScI),\nEleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC),\nJos�� A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes��s Gonz��lez (UNAM),\nCarlos Rom��n-Z����iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC),\nJohn Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:\n\nWe observed the field of GRB 160203A (D'Avanzo, et al., GCN 18979) 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 2016/02 4.36 to 2016/02 4.55 UTC (30.42 to\n34.94 hours after the BAT trigger), obtaining a total of 3.27 hours\nexposure in the r, i, and z bands.\n\nFor a source within the Swift-XRT error circle (Osborne, et al., GCN\n18983), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the\nfollowing detections and upper limit (3-sigma):\n\n  r = 23.35 +/- 0.21\n  i = 22.90 +/- 0.13\n  z > 20.55\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": 18989,
  "createdOn": 1454604965000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 160203A: RATIR Optical Observations",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 160203A"
}