{
  "bibcode": "2013GCN.14438....1B",
  "format": "text/plain",
  "version": 2,
  "eventId": "GRB 130418A",
  "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": 14438,
  "createdOn": 1366665435000,
  "editedOn": 1731005581751,
  "subject": "GRB 130418A: Continued RATIR Optical and NIR Observations",
  "submitter": "Nat Butler at Az State U  <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 (UCSC),\nEleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC),\nJosé A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM),\nCarlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC)\nreport:\n\nWe observed the field of GRB 130418A (de Pasquale et al., GCN 14377) with\nthe Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on\nthe 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional\non Sierra San Pedro Mártir from 2013/04 22.14 to 2013/04 22.33 UTC (80.35\nto 84.95 hours after the BAT trigger), obtaining a total of 2.84 hours\nexposure in the r' and i' bands and 1.19 hours exposure in the Z, Y, J, and\nH bands.\n\n\nAt the position of the transient observed on 2013/04/19 (GCN 14388) and\n2013/04/20 (GCN 14404), in comparison with SDSS DR8 and 2MASS, we obtain\nthe following upper limits (3-sigma) in the AB magnitude system:\n\n r'> 23.12\n i'> 22.93\n Z > 22.52\n Y > 21.89\n J > 21.85\n H > 21.25\n\nThese magnitudes are not corrected for Galactic extinction in the direction\nof the GRB.  The source is thus more than about 1 magnitude fainter than it\nwas observed to be two days ago.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir.",
  "email": "natbutler@asu.edu"
}