{
  "bibcode": "2015GCN.18141....1B",
  "body": "Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William\nH. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (UCB), J. Xavier Prochaska\n(UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja\n(GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos�� A. de\nDiego (UNAM), Leonid Georgiev (UNAM), Jes��s Gonz��lez (UNAM), Carlos\nRom��n-Z����iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John\nCapone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:\n\nWe observed the field of GRB 150811A (Evans, et al., GCN 18119) 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 2015/08 14.22 to 2015/08 14.41 UTC (73.12 to\n77.68 hours after the BAT trigger), obtaining a total of 3.56 hours\nexposure in the r, i, and z bands.\n\nIn comparison with the USNO-B1 and 2MASS catalogs, we obtain the following\ndetections and upper limit (3-sigma):\n\n  r = 22.4 +/- 0.3\n  i = 22.0 +/- 0.4\n  z > 20.37\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.  The fading of the source remains\nconsistent with t^(-1) (see, Butler et al., 18120, 18132, 18140).\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 18141,
  "createdOn": 1439582504000,
  "email": "natxbutler@gmail.com",
  "subject": "GRB 150811A: Continued RATIR Observations",
  "submitter": "Nat Butler at UC berkeley  <natxbutler@gmail.com>",
  "eventId": "GRB 150811A"
}