{
  "bibcode": "2018GCN.22509....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 180316A (Melandri, et al., GCN 22500) 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 2018/03 16.39 to 2018/03 16.52 UTC (4.34 to\n7.49 hours after the BAT trigger), obtaining a total of 2.29 hours exposure\nin the r and i bands.\n\nThe afterglow is well-detected within the Swift-XRT error circle (Evans, et\nal., GCN 22501).   In comparison with the USNO-B1 catalog, we obtain:\n\n  r = 20.07 +/- 0.02\n  i = 19.87 +/- 0.02\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.  The source appears so fade in flux\nwith time as t^(-1.4+/-0.1).\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 22509,
  "createdOn": 1521211058000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 180316A: RATIR Optical Observations",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 180316A"
}