{
  "bibcode": "2017GCN.21152....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), Harvey Moseley (GSFC), John\nCapone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:\n\nWe observed the field of GRB 170524A (Gropp, et al., GCN 21135) 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 2017/05 25.40 to 2017/05 25.46 UTC (13.79 to\n15.29 hours after the BAT trigger), obtaining a total of 1.06 hours\nexposure in the r and i bands and 0.36 hours exposure in the Z, Y, J, and H\nbands.\n\nWe again observed from 2017/05 26.32 to 2017/05 26.47 UTC (35.77 to 39.48\nhours after the BAT trigger), obtaining a total of 2.42 hours exposure in\nthe r and i bands and 1.01 hours exposure in the Z, Y, J, and H bands.\n\nFor a source within the Swift-XRT error circle (Evans, et al., GCN 21136),\nin comparison with the USNO-B1 and 2MASS catalogs, we obtain the following\nupper limits (3-sigma):\n\n     5/25      5/26\n  r  > 24.45   > 25.66\n  i  > 23.25   > 24.52\n  Z  > 21.72   > 23.00\n  Y  > 21.26   > 22.57\n  J  > 18.16   > 21.25\n  H  > 17.83   > 21.50\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": 21152,
  "createdOn": 1495825739000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 170524A: RATIR Optical and NIR Observations",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 170524A"
}