GCN Circular 9937
Subject
GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
Date
2009-09-27T01:36:29Z (15 years ago)
From
Josh Haislip at U.North Carolina <haislip@physics.unc.edu>
J. Haislip, D. Reichart, 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 of GRB 090926A (Uehara et al.,
GCN 9934) with four of the 16" PROMPT telescopes at CTIO beginning 19.0
hours after the trigger in UBVRI.
We detect an optical source within the Swift/XRT localization (Vetre et
al., GCN 9936) that is not in the DSS (POSS-II Red), at
RA = 23:33:36.02
DEC = -66:19:26.5
Stacking only images that increase the limiting magnitude yields:
mean
time
since cal.
trig. tel. exp. fil. magnitude stars
(h) (# x s)
19.9 PROMPT-2 22 x 80 V 18.81 +0.10 -0.09 52 NOMAD
20.0 PROMPT-5 22 x 80 I 18.24 +0.04 -0.04 165 USNO B1
20.0 PROMPT-4 24 x 80 R 18.06 +0.03 -0.03 230 USNO B1