[vsnet-grb-info 5841] GRB 080320: Early Super-LOTIS Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7492
SUBJECT: GRB 080320: Early Super-LOTIS Observations
DATE:    08/03/21 01:56:21 GMT
FROM:    Grant Williams at Steward Observatory  <ggwilli at gmail.com>

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 080320 (Swift Trigger 306858, Grupe et al. GCN 7473) at
04:38:34.3 UT, 56.3 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.

We do not detect any variable sources or afterglow candidates within
the refined XRT error box (Goad et al. GCN 7479) or at the location of
the OT candidate (Tanvir et al. GCN 7488, Updike et al. GCN 7491) in
any of our single exposures or combined exposures to the following
3-sigma limiting magnitudes:

t_start (UT)    t_end (UT)     exp t (s)     t_start-t_0 (s)    Limit
       coadd?
----------------------------------------------------------------------------------------------------------
04:38:34.3     04:38:44.3     10.0           56.3                R > 17.7      N
04:39:59.3     04:40:19.3     20.0           141.3              R > 18.3      N
04:42:13.7     04:43:13.7     60.0           275.7              R > 19.0      N
04:38:34.3     04:39:52.6     50.0           56.3                R > 18.7      Y
04:39:59.3     04:42:07.0     100.0         141.3               R > 19.4      Y
04:42:13.7     04:47:41.5     300.0         275.7               R > 20.0      Y