A. Trotter, J. Haislip, D. Reichart, V. Hoette, K. Cudworth, D. Harper,
R. Kron, T. Linder, R. Russell, E. Struble, A. Aji, R. Beauchemin, T.
Berger, A. Dow, A. Foster, N. Frank, M. Hinckle, K. Ivarsen, A.
LaCluyze, M. Maples, J. Moore, M. Nysewander, C. Salemi, L. Zbinden, and
J. A. Crain report:
Skynet observed the Swift BAT/XRT localization of GRB 141026A (Hagen et
al., GCN 16950, Swift trigger=616502) with one 24" telescope (PROMPT 8;
I band) and four 16" telescopes (PROMPT 3,1,4,5; BVRI bands) of the
PROMPT array at CTIO, Chile, and with the 41" telescope of Yerkes
Observatory in Wisconsin, USA (g'r'i' bands).
Starting at 2014-10-26 02:38:30 UT and continuing until 03:03 UT
(t=1.5-26m post-trigger), Skynet took a total of 89 exposures ranging
from 10s-160s each. We stacked subsets of these images to maximize the
S/N ratio, and detected no optical source in any band at the OT position
first reported by RATIR (Littlejohns et al., GCN 16952), and confirmed
in later notices. Our 3-sigma limiting magnitudes are:
tmid scope expos fil limit
10m PROMPT3 4x80s B >19.9
20m PROMPT1 4x160s V >20.4
19m PROMPT4 3x160s R >19.8
17m PROMPT5 4x80s I >19.9
17m PROMPT8 12x80s I >20.0
63m Yerkes 1x80s g' >21.2
60m Yerkes 2x80s r' >20.9
66m Yerkes 1x80s i' >20.5
BVRI magnitudes are in the Vega System, and g'r'i' magnitudes are in the
AB system, calibrated to 4 APASS stars in the field. Magnitudes have
not been corrected for line-of-sight Milky Way dust extinction, with
expected E(B-V)=0.16 (Schlafly & Finkbeiner 2011).
No further Skynet observations are scheduled.