{
  "bibcode": "2016GCN.19391....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 160504A (Malesani, et al., GCN 19382) 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 2016/05 5.21 to 2016/05 5.36 UTC (19.64 to\n23.11 hours after the BAT trigger), obtaining a total of 2.49 hours\nexposure in the r and i bands and 1.04 hours exposure in the Z, Y, J, and H\nbands.\n\nFor a source within the Swift-XRT error circle (Goad, et al., GCN 19386),\nin comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following\ndetection and upper limits (3-sigma):\n\n r > 23.70\n i = 23.62 +/- 0.36\n Z > 22.38\n Y > 22.08\n J > 21.73\n H > 21.35\n\nThese magnitudes, which appear to be consistent with those reported by\nCenko et al., (GCN 19389), are in the AB system and are not corrected for\nGalactic extinction in the direction of the GRB.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 19391,
  "createdOn": 1462475853000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 160504A: RATIR Optical and NIR Observations",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 160504A"
}