TITLE: GCN GRB OBSERVATION REPORT NUMBER: 810 SUBJECT: CONCAM crude optical limits before and after GRB000926 DATE: 00/09/29 01:03:57 GMT FROM: Robert Nemiroff at Michigan Tech. R. J. Nemiroff, D. Perez-Ramirez, J. B. Rafert, W. E. Pereira, C. Ftaclas, and J. Fernandez (Michigan Tech) report on behalf of the CONCAM collaboration: "The CONtinuous CAMera (CONCAM) operating on the roof of the RMT building at Kitt Peak National Observatory in Arizona has recorded data that provides very crude limits on the attributes of the OT through non-detection. Before the GRB Trigger From (2000 September 26.135) to (2000 September 26.263), spanning from roughly 20.6 hours to 17.5 hours before the Konus trigger, no obvious optical transient brighter than visual magnitude 4 was recorded. After the GRB Trigger From (2000 September 27.100) to (2000 September 27.252), spanning from roughly 2.6 hours to 6.2 hours after the Konus trigger, no obvious optical transient brighter than visual magnitude 4 was recorded. These above results were derived from a visual inspection of a series of two-minute exposures of the nearly 2 pi steradian CONCAM field. A more detailed inspection of the data might improve these magnitude limits to approximately visual magnitude 6. Data remains freely available at http://concam.net .