{
  "bibcode": "2010GCN.10687....1C",
  "body": "Z. Cano, A. Melandri (Liverpool JMU), C. Guidorzi (U. Ferrara), C.\nMundell, R.J. Smith, D. Bersier, I.A. Steele, S. Kobayashi, C.J. Mottram,\n(Liverpool JMU), A. Gomboc (U. Ljubljana) report, on behalf of a larger\ncollaboration:\n\nWe observed the field of GRB 100424A (Hoversten et al. GCNC 10667) with\nthe Liverpool Telescope starting 20:54 UT on April 24, 2010.  We do not\ndetect the NIR afterglow discovered by Cenko et al. (GCN 10682), nor any\nother object within the enhanced XRT error circle (Evans, GCN 10668; Evans\net al., GCN 10669) down to the following limits:\n\n-------------------------------------------------------------------\n Mid Exposure        Total\n  T-To (hrs)   Exposure Time (min)     Filter          upper limit\n-------------------------------------------------------------------\n     6.91              30                 B              >21.5\n     6.92              50                 I              >21.8\n     8.38              20                 R              >21.7\n-------------------------------------------------------------------\n\nThe upper limits are for an isolated object in our images and are\ncalibrated using nearby stars in the USNO-B1 catalogue.  No correction for\nGalactic extinction has been made.",
  "circularId": 10687,
  "createdOn": 1272205515000,
  "email": "zec@astro.livjm.ac.uk",
  "subject": "GRB 100424A: Liverpool Telescope Upper Limits",
  "submitter": "Zach Cano at ARI/John Moores Liverpool  <zec@astro.livjm.ac.uk>",
  "eventId": "GRB 100424A"
}