{
  "bibcode": "2016GCN.18950....1W",
  "body": "Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC),\nWilliam H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI),\nJ. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara\n(GSFC/STScI), Eleonora Troja (GSFC), Owen Littlejohns (ASU),\nEnrico Ramirez-Ruiz (UCSC), Jos�� A. de Diego (UNAM), Leonid Georgiev\n(UNAM), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Neil\nGehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach \nGolkhou (ASU), and Vicki Toy (UMD) report:\n\nWe observed the field of GRB 160127A (Amaral-Rogers et al., GCN Circular\n18938) with the Reionization and Transients Infrared Camera (RATIR;\nwww.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio\nAstron��mico Nacional on Sierra San Pedro M��rtir from 2016/01 29.43 to\n2016/01 29.55 UTC (49.72 to 52.43 hours after the BAT trigger),\nobtaining a total of 1.48 hours exposure in the r, i, and z bands.\n\nWe no longer detect the optical counterpart reported by Amaral-Rogers et\nal. (GCN Circular 18938), Klotz et al. (GCN Circular 18939), Cucchiara\net al. (GCN Circular 18941), and Siegel et al. (GCN Circular 18945). In\ncomparison with the SDSS DR9 catalog, we obtain the following 3-sigma\nupper limits:\n\n r\t> 23.15\n i\t> 23.09\n z\t> 20.00\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": 18950,
  "createdOn": 1454086594000,
  "email": "alan@astro.unam.mx",
  "subject": "GRB 160127A: RATIR Optical Observations",
  "submitter": "Alan M. Watson at Instituto de Astronomia UNAM  <alan@astro.unam.mx>",
  "eventId": "GRB 160127A"
}