{
  "bibcode": "2002GCN..1480....1R",
  "body": "E. Rykoff, D. Smith on behalf of the ROTSE Collaboration, report:\n\n\"ROTSE-IIIa responded automatically to GRB020813 (HETE trigger 2262) and started \nimaging at 13 August 2002 02:48:48.50 UT, 4.48 minutes after the start of the \nburst, and 15 seconds after receipt of GRB coordinates from the GCN. This \nresponse was during early twilight at Los Alamos National Laboratory, and our \nfirst several images were saturated by bright sky. Our first usable exposure, 60 \nseconds in duration beginning at 03:02:36.28, shows no optical transient to an \nunfiltered limiting magnitude ~ 16.0 under adverse conditions. Our typical limit \nis several magnitudes deeper. This limit is around 0.5 magnitude brighter than \nthe extrapolation of the decay of the OT as reported by Li, et. al. (GCN \ncircular 1473).\"\n\nThis message may be cited.",
  "circularId": 1480,
  "createdOn": 1029277784000,
  "email": "erykoff@umich.edu",
  "subject": "Early Time Limits for GRB020813",
  "submitter": "Eli Rykoff at Univ. of Michigan/ROTSE  <erykoff@umich.edu>",
  "eventId": "GRB 020813"
}