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GCN Circular 16967

Subject
GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
Date
2014-10-27T20:26:34Z (10 years ago)
From
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter@physics.unc.edu>
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
               4X160s
17m  PROMPT8 12x80s   I   >20.0
63m  Yerkes   1x80s   g'  >21.2
               2x160s
60m  Yerkes   2x80s   r'  >20.9
               1x160s
66m  Yerkes   1x80s   i'  >20.5
               1x160s
==================================

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.
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