GCN Circular 5588
Subject
GRB 060923: Early Super-LOTIS Observations
Date
2006-09-23T08:42:34Z (18 years ago)
From
Grant Williams at Steward Observatory <ggwilli@mmto.org>
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.