{
  "body": "Eleonora Troja (GSFC), Nat Butler (ASU), Alan M. Watson (UNAM),\nAlexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM),\nChris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom\n(UCB), Antonino Cucchiara (UCSC), Owen Littlejohns (ASU), Enrico\nRamirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM),\nJesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC),\nand Harvey Moseley (GSFC) report:\n\nWe again observed the field of GRB 130518A (Xiong, et al., GCN 14674;\nOmodei, et al., GCN 14675) with the Reionization and Transients Infrared\nCamera (RATIR;www.ratir.org) on the 1.5m Harold Johnson Telescope at\nthe Observatorio Astronómico Nacional on Sierra San Pedro Mártir from\n2013/05 20.43 to 2013/05 20.46 UTC (44.41 to 45.24 hours after the GBM\ntrigger), obtaining a total of 0.71 hours exposure in the r' and i' bands.\n\nIn comparison with SDSS DR8, we obtain the following detections of the source\nreported earlier (Troja, et al., GCN 14678; Cenko, GCN 14680):\n\nr'    20.47 ± 0.04\ni'    20.19 ± 0.04\n\nThese magnitudes are in the AB system and not corrected for Galactic\nextinction in the direction of the GRB.\n\nIn comparison with our earlier observations (Troja, et al., GCN 14678), the source\nhas faded by slightly more than 1 magnitude in r' and i' between about 21 hours\nand 45 hours after the trigger. This confirms that the source corresponds to the\nafterglow of GRB 130518A.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir.",
  "format": "text/plain",
  "bibcode": "2013GCN.14684....1T",
  "email": "eleonora.troja@nasa.gov",
  "editedOn": 1731009280729,
  "eventId": "GRB 130518A",
  "subject": "GRB 130518A: Continued RATIR Optical Observations - Fading",
  "createdOn": 1369063809000,
  "circularId": 14684,
  "submitter": "Eleonora Troja at GSFC  <eleonora.troja@nasa.gov>",
  "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
}