{
  "bibcode": "2021GCN.30084....1B",
  "body": "Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William\nH. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier\nProchaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora\nTroja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes��s\nGonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Harvey Moseley (GSFC), John\nCapone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:\n\nWe observed the field of GRB 210527A (Laha, et al., GCN 30081) with the\nReionization and Transients Infrared Camera (RATIR) on the 1.5m Harold\nJohnson Telescope at the Observatorio Astron��mico Nacional on Sierra San\nPedro M��rtir from 2021/05 27.30 to 2021/05 27.32 UTC (0.01 to 0.56 hours\nafter the BAT trigger), obtaining a total of 0.19 hours exposure in the r\nand i bands and 0.25 hours exposure in the Z, Y, J, and H bands.\n\nWe find no new sources within the refined XRT error region (Evans, et al.,\nGCN 30083).   In comparison with the SDSS DR9 and 2MASS catalogs, we obtain\nthe following upper limits (3-sigma):\n\n  r     > 21.67\n  i     > 21.70\n  Z     > 21.54\n  Y     > 21.32\n  J     > 20.78\n  H     > 20.42\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": 30084,
  "createdOn": 1622138024000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 210527A: RATIR Optical and NIR Observations",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 210527A"
}