{
  "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 140304A (Evans, et al., GCN 15915) 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 2014/03 6.12 to 2014/03 6.14 UTC (37.55 to\n38.08 hours after the BAT trigger), obtaining a total of 0.36 hours\nexposure in the r and i bands and 0.15 hours exposure in the Z,\nY, J, and H bands.\n\nFor a source within the Swift-XRT error circle, in comparison with the SDSS\nDR9 and 2MASS, we obtain the following detection and upper limits (3-sigma):\n\n  r     > 22.77\n  i     > 22.60\n  Z     20.88 +/- 0.20\n  Y     > 20.96\n  J     > 20.65\n  H     > 20.31\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.  In the Z-band, the source has\nfaded as a powerlaw t^(-1.3) relative to our observations conducted last\nnight (Butler et al., GCN 15928).\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir.",
  "email": "natbutler@asu.edu",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "createdOn": 1394125025000,
  "bibcode": "2014GCN.15937....1B",
  "version": 2,
  "format": "text/plain",
  "eventId": "GRB 140304A",
  "subject": "GRB 140304A: Continued RATIR Optical and NIR Observations",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>",
  "circularId": 15937,
  "editedOn": 1731005383992
}