{
  "bibcode": "2014GCN.16575....1B",
  "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), Jos�� A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes��s\nGonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Neil Gehrels (GSFC), and\nHarvey Moseley (GSFC) report:\n\nWe observed the field of GRB 140709A (Hagen, et al., GCN 16546) 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 from 2014/07 9.17 to 2014/07 9.46 UTC (2.76 to\n9.93 hours after the BAT trigger), obtaining a total of 4.98 hours exposure\nin the r and i bands and 2.09 hours exposure in the Z, Y, J, and H bands\nand again from 2014/07 10.17 to 2014/07 10.42 UTC (26.77 to 32.87 hours\nafter the BAT trigger), obtaining a total of 4.27 hours exposure in the r\nand i bands and 1.79 hours exposure in the Z, Y, J, and H bands.\n\nWe detect the afterglow candidate reported by Castro-Tirado et al. (GCN\n16554; also Masi, et al., GCN 16559; Castro-Tirado, et al., GCN 16564) in\nboth epochs, adding a deeper integration for our first epoch as compared to\nour initial report (Butler, et al., GCN 16547).  Relative to 2MASS and\nusing the RATIR zero-points, we find:\n\n     7/09                   7/10\n  r  24.28 +/- 0.45   23.85 +/- 0.31\n  i  23.05 +/- 0.16   23.28 +/- 0.20\n  Z >22.92             >22.68\n  Y >22.40             >22.33\n  J >22.30             >22.27\n  H >21.94             >21.85\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.  Upper limits are 3-sigma.  We\ncannot reliably confirm fading in this source.  We note that another RATIR\nsource outside of the Swift XRT error region (see, GCN 16547) does not\nappear to fade and is not likely to be the afterglow to GRB 140709A.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 16575,
  "createdOn": 1405034508000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 140709A: Continued RATIR Optical and NIR Observations",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 140709A"
}