{
  "bibcode": "2020GCN.26862....1W",
  "body": "Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC),\nWilliam H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J.\nXavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI),\nEleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz\n(UCSC), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Harvey\nMoseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki\nToy (UMD) report:\n\nWe observed the field of GRB 200122A (Sonbas et al., GCN Circ. 26844)\nwith 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 2020/01 22.35 to\n2020/01 22.56 UTC (6.67 to 11.76 hours after the BAT trigger), obtaining\na total of 3.76 hours exposure in the r and i bands.\n\nFor a source within the Swift-XRT enhanced error circle (Osborne et al.,\nGCN Circ. 26846), in comparison with the SDSS DR9 and 2MASS catalogs, we\nobtain the following 3-sigma upper limits:\n\n  r\t> 23.72\n  i\t> 23.42\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": 26862,
  "createdOn": 1579752846000,
  "email": "alan@astro.unam.mx",
  "subject": "GRB 200122A: RATIR Optical Observations",
  "submitter": "Alan M Watson at UNAM  <alan@astro.unam.mx>",
  "eventId": "GRB 200122A"
}