TITLE:   GCN CIRCULAR
NUMBER:  9989
SUBJECT: GRB 091003: Skynet/DSO Observations
DATE:    09/10/04 18:14:15 GMT
FROM:    Josh Haislip at U.North Carolina  <haislip@physics.unc.edu>

J. Haislip, D. Reichart, A. Smith, D. Caton, L. Hawkins, K. Ivarsen, A. 
LaCluyze, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, 
J. A. Crain, and M. Nysewander report:

Skynet observed the Fermi/LAT localization (McEnery, Chiang & Hanabata, GCN 
9985) of GRB 091003 (Rau, GCN 9935) with the 14" Dark Sky Observatory 
telescope in North Carolina beginning 20.2 hours after the trigger in BVRI.

We do not detect the afterglow (Starling & Beardmore, GCN 9986; Gronwall & 
Starling, GCN 9987).  Stacking only images that increase the limiting 
magnitude yields:

mean                                             1-sig.  1-sig.
time                          3-sig.             sys.    stat.
since                         lim.    cal.       cal.    cal.
trig.  tel.    exp.     fil.  mag.    stars*     unc.    unc.
(h)            (# x s)                           (mag)   (mag)

21.0   DSO-14  16 x 80  V     19.6    58 SDSS 7  0.076   0.000
21.0   DSO-14  17 x 80  B     19.5    33 SDSS 7  0.087   0.001
21.0   DSO-14  16 x 80  R     19.8    64 SDSS 7  0.064   0.000
21.0   DSO-14  16 x 80  I     19.3    45 SDSS 7  0.049   0.000

* Transformed using Jester et al., 2005, ApJ, 130, 873.