{
  "bibcode": "2012GCN.13776....1Z",
  "body": "Weikang Zheng and Carl Akerlof (Umich), report on behalf of the ROTSE\ncollaboration (the authors are not affiliated with the Fermi Collaboration),\n\nThe recent GCN Circulars we reported about Fermi-LAT upper limits for\nGRB 120807A (GCN 13608), 120908A (GCN 13742), 120909A (GCN 13742), and\n120911A (GCN 13752) contain an error about the upper limits estimation\ndue to a wrong method. We apologize for the confusion. We thank Giacomo\nVianello from LAT group for pointing it out and making suggestion to\ncorrect it. We've updated our pipeline result with the appropriate\nmethod (see The Fermi LAT team, Ackermann et al., 2012, ApJ, 754, 121).\nWe report the corrected upper limit result (100 MeV -300 GeV; T0-T0\n+47.5s) for the 4 GRBs again:\n\nGRB 120807A : 5.42e-05 ph/cm2/s\nGRB 120908A : 1.79e-04 ph/cm2/s\nGRB 120909A : 8.70e-05 ph/cm2/s\nGRB 120911A : 3.81e-05 ph/cm2/s",
  "circularId": 13776,
  "createdOn": 1347916966000,
  "email": "zwk@umich.edu",
  "subject": "Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A",
  "submitter": "Weikang Zheng at U.of Michigan  <zwk@umich.edu>",
  "eventId": "GRB 120807A"
}