TITLE:   GCN CIRCULAR
NUMBER:  7443
SUBJECT: GRB 080319C: Early Super-LOTIS Observations
DATE:    08/03/19 13:30:10 GMT
FROM:    Grant Williams at Steward Observatory  <ggwilli@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 080319C (Swift Trigger 306778, Pagani et al. GCN 7442) at
12:26:38.5 UT, 42.5 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 detect the afterglow reported by Li et al. (GCN 7441) in our
earliest 10 second exposure.  Using the USNO-B1.0 star (453-025776) at
RA=17:15:51.7, Dec=55:23:38.4 with R2MAG=14.61, we estimate the
following R-band magnitude for the OT:

t_start (UT)	exp t (s)	t_start-t_0 (s)	R Mag
----------------------------------------------------------------
12:26:38.5	10 		42.5 		R = 16.83 +/- 0.13

Additional observations and analysis are ongoing.