{
  "bibcode": "2016GCN.19243....1G",
  "body": "V. Zach Golkhou (ASU), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander\nKutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox\n(STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara\n(GSFC/STScI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico\nRamirez-Ruiz (UCSC), Jos�� A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes��s\nGonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Neil Gehrels (GSFC), Harvey\nMoseley (GSFC), John Capone (UMD), and Vicki Toy (UMD) report:\n\nWe observed the field of GRB 160327A (Racusin, et al., GCN 19235) 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 2016/03 28.14 to 2016/03 28.39 UTC (17.98 to\n24.15 hours after the BAT trigger), obtaining a total of 4.21 hours\nexposure in the r and i bands and 1.76 hours exposure in the Z, Y, J, and H\nbands.\n\nFor a source within the Swift-XRT error circle (Goad, et al., GCN 19237),\nin comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following\ndetections:\n\n  r\t23.84 +/- 0.22\n  i\t23.29 +/- 0.14\n  Z\t22.57 +/- 0.20\n  Y\t22.83 +/- 0.35\n  J\t22.43 +/- 0.29\n  H\t21.75 +/- 0.23\n\nThese magnitudes are in the AB system and are not corrected for\nGalactic extinction\nin the direction of the GRB. Compared to our previous night of observations\n(Golkhou et al., GCN 19236), the source flux has decayed substantially in\nall bands. The source r - i color changes from 2.1 +/- 0.1 to 0.6 +/-\n0.3 between our first and the second night observations. The strong color\nchange suggests the possibility of contamination by the GRB host galaxy at\nlate-time.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 19243,
  "createdOn": 1459196870000,
  "email": "golkhou@gmail.com",
  "subject": "GRB 160327A: Continued RATIR Optical and NIR Observations",
  "submitter": "V. Zach Golkhou at ASU/RATIR  <golkhou@gmail.com>",
  "eventId": "GRB 160327A"
}