[AAVSO-HEN] GRB 090726: Skynet/GORT 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:  9926
SUBJECT: GRB 090726: Skynet/GORT Observations
DATE:    09/09/19 20:44:14 GMT
FROM:    Josh Haislip at U.North Carolina  <haislip at physics.unc.edu>

J. Haislip, D. Reichart, L. Cominsky, K. McLin, T. Graves, G. Spear, 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 Skynet/BAT localization of GRB 090726 (Page et al., GCN 
9706) with the 14" GORT telescope at Hume Observatory in California 
beginning 5.9 hours after the the trigger in I.

We do not detect the afterglow (Page et al., GCN 9707; Moskvitin, 
Fatkhullin & Valeev, GCN 9709).  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)

6.2     GORT   15 x 80   I      19.8     84 USNO B1    0.213    0.002
6.8     GORT   8 x 80    R      20.2     178 USNO B1   0.235    0.001