TITLE: GCN CIRCULAR NUMBER: 927 SUBJECT: GRB010126: CONCAM crude optical limits during GRB DATE: 01/01/30 00:16:18 GMT FROM: Robert Nemiroff at Michigan Tech. R. J. Nemiroff, D. Perez-Ramirez, W. E. Pereira, J. B. Rafert, C. Ftaclas, and J. Fernandez (Michigan Tech) report on behalf of the CONCAM collaboration: The CONtinuous CAMera (CONCAM) operating at Kitt Peak National Observatory has recorded fisheye images that provide crude limits on the attributes of an OT through non-detection. A relevant CONCAM frame contains an integration from 33022 s to 33202 s that brackets 33048 s, the time of the GRB trigger reported by Hurley et al. in GCN922, and the duration of the GRB as reported by Hurley et al. in GCN 921. Raw FITS data are available at http://concam.net . Processed GIF images of this frames, the previous frame, and the following frame, are available here: http://concam.net/kp010126/kp010126ut0902.gif http://concam.net/kp010126/kp010126ut0910.gif http://concam.net/kp010126/kp010126ut0914.gif No obvious optical counterpart down to about visual magnitude 6.3 over the three-minute exposure is visible on the frames. This is, to the best of our knowledge, the first time an optical electronic instrument was observing a GRB location during a GRB trigger. The time recorded on the CONCAM frames are behind the actual UT time by about 26 seconds. We have corrected for this in this report so that the uncertainty in the above reported times is only about 2 seconds.