{
  "bibcode": "2013GCN.14179....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 (UCSC),\nEleonora Troja (GSFC), Enrico Ramirez���Ruiz (UCSC), José A. de Diego\n(UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos\nRomán-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey\nMoseley (GSFC) report:\n\nWe observed the field of GRB 130131B (Siegel et al., GCN 14159) with the\nReionization and Transients Infrared Camera (RATIR; www.ratir.org) on the\n1.5m Harold Johnson Telescope at the Observatorio Astronómico\nNacional on Sierra San Pedro Mártir. Between 2013 February 1.42 and\n2013 February 1.54 UTC (14.86 to 17.70 hrs after the BAT trigger), we\nobtained 1.96 hrs exposure in the r and i bands and 0.73 hrs exposure in\nthe Z, Y, J, and H bands.\n\nWe detect no source within the XRT error circle (Goad et al., GCN 14165).\nIn comparison with SDSS DR8 and 2MASS, we derive the following upper limits\n(3-sigma) in the AB magnitude system:\n\n r' > 23.8\n i' > 23.1\nZ > 22.1\nY > 21.7\nJ  > 21.8\nH > 21.4\n\nThese magnitudes are not corrected for Galactic extinction in the direction\nof the GRB.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San\nPedro Mártir.",
  "circularId": 14179,
  "createdOn": 1359816680000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 130131B: RATIR Upper Limits",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 130131B"
}