{
  "bibcode": "2013GCN.14175....1T",
  "body": "N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), T.  Wold (JACH)\nreport on behalf of a larger collaboration:\n\nWe re-observed the field of GRB 130131A with the WFCAM camera on\nUKIRT, beginning approximately 20.5 hr post-burst.  The source reported\nby us previously (GCN 14157) is no longer detected in our provisional\nreduction, indicating a fading of at least 2 mag in the K-band.  This confirms\nthe source as the afterglow of the GRB (consistent also with the radio detection\nby Zauderer et al. GCN 14171).\n\nWe also report that the afterglow was faintly visible in a Z-band image\ntaken at UKIRT 2hr post-burst (in morning twilight), indicating that this\nis likely not an extreme redshift event.",
  "circularId": 14175,
  "createdOn": 1359728861000,
  "email": "nrt3@star.le.ac.uk",
  "subject": "GRB 130131A - UKIRT confirmation of afterglow",
  "submitter": "Nial Tanvir at U.Leicester  <nrt3@star.le.ac.uk>",
  "eventId": "GRB 130131A"
}