{
  "circularId": 16050,
  "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>",
  "version": 2,
  "bibcode": "2014GCN.16050....1L",
  "createdOn": 1396255528000,
  "subject": "GRB 140331A: RATIR Optical and NIR Observations",
  "submitter": "Owen Littlejohns at Az State U  <olittlej@asu.edu>",
  "editedOn": 1731008815760,
  "format": "text/plain",
  "eventId": "GRB 140331A",
  "email": "olittlej@asu.edu",
  "body": "Owen Littlejohns (ASU), Nat Butler (ASU), Alan M. Watson (UNAM),\nAlexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer\n(UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska\n(UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora\nTroja (GSFC), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM),\nLeonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga\n(UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:\n\nWe observed the field of GRB 140331A (Zhang, et al., GCN 16049) with\nthe Reionization and Transients Infrared Camera (RATIR; www.ratir.org)\non the 1.5m Harold Johnson Telescope at the Observatorio Astronómico\nNacional on Sierra San Pedro Mártir from 2014/03 31.26 to 2014/03\n31.32 UTC (0.35 to 1.87 hours after the BAT trigger), obtaining a total of\n1.04 hours exposure in the r and i bands and 0.44 hours exposure in the\nZ, Y, J, and H bands.\n\nFor a source within the Swift-XRT error circle, in comparison with\nthe SDSS DR9 and 2MASS, we obtain the following detections:\n\n  r     22.02 +/- 0.11\n  i     20.79 +/- 0.04\n  Z     20.14 +/- 0.06\n  Y     19.81 +/- 0.07\n  J     19.75 +/- 0.08\n  H     19.76 +/- 0.12\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB. This position coincides with a\npreviously detected source, SDSS J085927.51+024304.0. We note that our\nr, i and Z band magnitudes are broadly consistent with those of the SDSS.\n\nFitting Milky Way, LMC and SMC extinction laws in addition to the IGM\n(see Littlejohns, et al. 2014) we find the source is possibly of high\nredshift, with a photometric redshift of z = 4.65 (+0.34,-2.80; 90% conf.).\nThe large lower limit in the confidence region is due to a potential\nsolution\nwith a high quantity of Milky Way type dust.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir."
}