{
  "bibcode": "2003GCN..2495....1R",
  "body": "E. S. Rykoff, R. Quimby, C. W. Akerlof and B. E. Schaefer report on behalf\nof the ROTSE collaboration:\n\nThe ROTSE-IIIb telescope at McDonald Observatory, Texas, responded\nautomatically to HETE Trigger 2976 (GRB031220).  Our first image of the\nfinal SXC localization was taken 6 seconds after the receipt of HETE\nTrigger 2976-6 on December 20, 05:16:14 UT, 1.77 hours after the burst.\nThe system took 10x5 sec, 10x20 sec and 160x60 sec exposures.  After\nco-adding sets of ten images, comparison to the USNO-B catalog reveals no\nnew sources in the SXC error box. Furthermore, visual comparison to the\nDSS-2 Red and IR Plates reveal no new sources to an unfiltered limiting\nmagnitude of 19.2 at 1.9 hours after the burst.",
  "circularId": 2495,
  "createdOn": 1071943367000,
  "email": "erykoff@umich.edu",
  "subject": "GRB031220: ROTSE-IIIb Optical Limits",
  "submitter": "Eli Rykoff at Univ. of Michigan/ROTSE  <erykoff@umich.edu>",
  "eventId": "GRB 031220"
}