{
  "editedOn": 1731009341687,
  "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>",
  "circularId": 17898,
  "email": "natbutler@asu.edu",
  "bibcode": "2015GCN.17898....1B",
  "format": "text/plain",
  "createdOn": 1433255100000,
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "version": 2,
  "eventId": "GRB 150527A",
  "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 initially from 2015/05 27.29 to 2015/05 27.45 UTC\n(0.17 to 4.06 hours after the BAT trigger), obtaining a total of 3.10 hours\nexposure in the r, i, and z bands and then again from 2015/05 28.25 to\n2015/05 28.47 UTC (23.27 to 28.36 hours after the BAT trigger), obtaining a\ntotal of 3.91 hours exposure in the r, i, and z bands.\n\nThe source we initially detected (Butler, et al., GCN 17876; RA, Dec =\n19:15:50.27, 4:12:4.7; J2000, +/-0.5\") in the Swift-XRT error circle\n(Evans, et al., GCN 17874) has not faded in our extended dataset and is,\ntherefore, unlikely to be the afterglow.\n\nWe note the REM source (Nicastro, et al., GCN 17881) is marginally detected\nin our first epoch observation with i=23.4 +/- 0.5, calibrated relative to\nthe USNO-B1 catalog.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir.",
  "subject": "GRB 150527A: Continued RATIR Observations"
}