{
  "bibcode": "2017GCN.21655....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(UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico\nRamirez-Ruiz (UCSC), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM),\nHarvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and\nVicki Toy (UMD) report:\n\nWe observed the field of GRB 170822A (Melandri et al., GCN Circ. 21640) 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 2017/08 23.44 to 2017/08 23.48 UTC (25.45\nto 26.38 hours after the BAT trigger), obtaining a total of 0.69 hours\nexposure in the r and i bands and 0.30 hours exposure in the Z,\nY, J, and H bands.\n\nFor a source within the Swift-XRT error circle, in comparison with the USNO-B1 \nand 2MASS catalogs, we obtain the following upper limits (3-sigma):\n\n r\t> 23.37\n i\t> 22.87\n Z\t> 21.99\n Y\t> 21.56\n J\t> 21.28\n H\t> 20.82\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.\n\nThe bright but rapidly-fading optical transient reported by Tello et al. \n(GCN Circ. 21642) is not seen in our images.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro \nM��rtir.",
  "circularId": 21655,
  "createdOn": 1503496794000,
  "email": "alan@astro.unam.mx",
  "subject": "GRB 170822A: RATIR Optical and NIR Observations",
  "submitter": "Alan M. Watson at Instituto de Astronomia UNAM  <alan@astro.unam.mx>",
  "eventId": "GRB 170822A"
}