[AAVSO-HEN] GRB 090807: Skynet/DSO Observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  9924
SUBJECT: GRB 090807: Skynet/DSO Observations
DATE:    09/09/18 06:01:13 GMT
FROM:    Josh Haislip at U.North Carolina  <haislip at physics.unc.edu>

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

Skynet observed the Swift/BAT localization of GRB 090807 (Cannizzo et al., 
GCN 9746) with the 14" Dark Sky Observatory telescope in North Carolina 
beginning 10.4 hours after the trigger in I.

We do not detect the afterglow (Cannizzo et al., GCN 9746).  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)

10.7    DSO-14   10 x 160   I      18.9     807 USNO B1   0.489    0.000