{
  "subject": "GRB 140423A: Continued RATIR Optical and NIR Observations",
  "eventId": "GRB 140423A",
  "bibcode": "2014GCN.16174....1B",
  "createdOn": 1398463859000,
  "circularId": 16174,
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "email": "natbutler@asu.edu",
  "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 140423A (Sonbas, et al., GCN 16142) 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 2014/04 25.15 to 2014/04 25.47 UTC (43.01 to\n50.78 hours after the BAT trigger), obtaining a total of 4.07 hours\nexposure in the r and i bands and 1.73 hours exposure in the Z, Y, J, and H\nbands.\n\nFor a source within the Swift-UVOT error circle (Chester, et al., GCN\n16147), in comparison with the SDSS DR9 and 2MASS, we obtain the following\ndetections and upper limit (3-sigma):\n\n  r     22.70 +/- 0.11\n  i     22.67 +/- 0.12\n  Z     22.49 +/- 0.35\n  Y     22.17 +/- 0.29\n  J     > 21.66\n  H     21.87 +/- 0.35\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.  Compared to our observations last\nnight (Littlejohns et al., GCN 16170), the source has faded approximately\nas t^(-1.3).\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir."
}