TITLE: GCN GRB OBSERVATION REPORT NUMBER: 437 SUBJECT: GRB 991106, LOTIS Optical Observations DATE: 99/11/07 04:52:55 GMT FROM: Grant Williams at Clemson G. G. Williams (Clemson Univ.), H. S. Park, R. Porrata (LLNL) report on behalf of the LOTIS collaboration: During a routine sky patrol the LOTIS telescope observed the field of GRB 991106 in two 10 s images at 2.65 minutes and 3.02 minutes after the burst (10:57:06 UT and 10:57:28 UT). There was no real-time BATSE trigger for this event. LOTIS also obtained 12 sky patrol images of the position prior to the burst during the interval 4:23:00 UT to 9:51:16 UT. Comparison of the images obtained after the burst with the previous sky patrol images, the Digital Sky Survey, and the Guide Star Catalog reveal no OT within the BeppoSAX WFC error box (Gandolfi et al. GCN 435) brighter than m = 13.4 (10-sigma). No astronomical filter was used during these observations. Further analysis is in progress. This message may be cited.