{
  "circularId": 17876,
  "version": 2,
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "format": "text/plain",
  "eventId": "GRB 150527A",
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>",
  "editedOn": 1731008707160,
  "email": "natbutler@asu.edu",
  "body": "Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William\nH. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB),\nJ. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara\n(ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico\nRamirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús\nGonzález (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and\nHarvey Moseley (GSFC) report:\n\nWe observed the field of GRB 150527A (Evans, et al., GCN 17874) with the\nReionization and Transients Infrared Camera (RATIR; www.ratir.org) on the\n1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on\nSierra San Pedro Mártir from 2015/05 27.29 to 2015/05 27.32 UTC (13.2 to\n54.6 minutes after the BAT trigger), obtaining a total of 0.58 hours\nexposure in the r, i, and z bands.\n\nA source is detected within the Swift-XRT error circle.  In comparison with\nthe USNO-B1 catalog, we obtain the following detections and upper limit\n(3-sigma):\n\n  r     21.17 +/- 0.10\n  i     20.83 +/- 0.14\n  z     > 19.50\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.  Additional observations are\nongoing.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir.",
  "bibcode": "2015GCN.17876....1B",
  "createdOn": 1432713858000,
  "subject": "GRB 150527A: RATIR Afterglow Detection"
}