TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5588 SUBJECT: GRB 060923: Early Super-LOTIS Observations DATE: 06/09/23 08:42:34 GMT FROM: Grant Williams at Steward Observatory G. G. Williams (MMTO) and P. A. Milne (Steward Observatory), on behalf of the Super-LOTIS Collaboration, report: The robotic 0.6-m Super-LOTIS telescope began observing the error box of GRB 060923 (Swift Trigger 230662, Stamatikos et al. GCN 5583) at 05:12:56.1 UT, 41.1 seconds after the trigger. Our initial observations include 5 x 10s exposures, 5 x 20s exposures, and 30 x 60s exposures, all in the R-band. The observations began at a high airmass of 2.92. We do not detect any variable sources or afterglow candidates within the XRT error box in our earliest exposure or in the sum of our first five exposures to the following 3-sigma limiting magnitudes determined from nearby USNO-B1.0 stars: t_start (UT) exp t (s) t_start-t_0 (s) Limit -------------------------------------------------------- 05:12:56.1 10.0 41.1 R > 16.6 +/- 0.15 05:12:56.1 5 x 10.0 41.1 R > 18.3 +/- 0.15 The errors are dominated by scatter in the USNO-B1.0 stars.