{
  "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 140318A (Cenko, et al., GCN 15986) 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 19.13 to 2014/03 19.50\nUTC (26.91 to 35.94 hours after the BAT trigger), obtaining a total of\n4.88 hours exposure in the r and i bands and 2.46 hours exposure in the\nZ and Y bands.\n\nWe continue to detect the previously reported optical counterpart\n(Littlejohns, et al., GCN 15990; Schulze, et al., GCN 15987). In\ncomparison with the SDSS DR9 and 2MASS, we obtain the following detections:\n\n  r     22.52 +/- 0.11\n  i     22.05 +/- 0.09\n  Z     21.58 +/- 0.12\n  Y     21.51 +/- 0.16\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB. Fading of the source is detected\nfor all of the four bands measured in both epochs of RATIR observations.\nWe note that the temporal decay index between these two epochs appears to\nbe shallower than that reported in Littlejohns, et al. (GCN 15990), with\n-0.5 < alpha < -0.3 for all four bands. This can be interpretted as the\nmagnitude approaching that of the underlying SDSS galaxy reported in\nSchulze, et al. (GCN 15987).\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir.",
  "createdOn": 1395265125000,
  "version": 2,
  "email": "olittlej@asu.edu",
  "eventId": "GRB 140318A",
  "subject": "GRB 140318A: Continued RATIR Optical and NIR Observations",
  "editedOn": 1731008219771,
  "bibcode": "2014GCN.15999....1L",
  "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>",
  "format": "text/plain",
  "circularId": 15999,
  "submitter": "Owen Littlejohns at Az State U  <olittlej@asu.edu>"
}