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GCN Circular 17161

Subject
GRB 141212A: Skynet R-COP Observations
Date
2014-12-12T15:14:45Z (9 years ago)
From
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter@physics.unc.edu>
A. Trotter, J. Haislip, D. Reichart, A. Verveer, T. Spuck, 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 141212A (Ukwatta 
et al., GCN 17158, Swift trigger=621229) with the 14" R-COP telescope at 
Perth Observatory, Australia. Starting at 2014-12-12 12:24 UT and 
continuing until 14:13 UT (t=10.2m-119m post-trigger), Skynet took a 
total of 24x160s exposures in the B, V, R, and I bands. We stacked 
subsets of these images to maximize the S/N ratio, and detected no 
optical source in any band at the XRT position.  Our 3-sigma limiting 
magnitudes are:

==================================
tmid  expos  fil  limit
==================================
87m   7x160s  B   >19.9
106m  8x160s  V   >20.5
41m   3x160s  R   >20.0
30m   2x80s   I   >18.5
==================================

Limiting magnitudes are in the Vega System, calibrated to 6 APASS stars 
in the field.  Magnitudes have not been corrected for line-of-sight 
Milky Way dust extinction, with expected E(B-V)=0.09 (Schlafly & 
Finkbeiner 2011).

No further Skynet observations are scheduled.
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