GCN Circular 15369
Subject
GRB 131024A: Skynet R-COP optical observations
Date
2013-10-24T19:12:32Z (11 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. LaCluyze,
N. Frank, J. Moore, T. Berger, H. T. Cromartie, R. Egger, A. Foster, K.
Ivarsen, M. Maples, M. Nysewander, E. Speckhard, and J. A. Crain report:
Skynet observed the Swift/XRT localization of the field of GRB 131024A
(Racusin et al., GCN 15365, Swift trigger # 575707) with the 14-inch
R-COP telescope at Perth Observatory, Australia, starting at 2013-10-24,
12:28:14 UT and continuing until 14:25 UT (t=1.9-118m post trigger).
R-COP took a total of 44x20-80s exposures simultaneously in the BRI bands.
In a stack of 2 early R-band images at a mean time t=6.9m we marginally
detect (S/N~3.5 sigma) an uncataloged source in the R band within the
XRT error circle, with R~18.9 mag. In later stacks at mean times
~70-80m, we obtain only 3-sigma upper limits in all three bands:
band t(mean) exp mag
B 69m 9x80s >19.2
R 80m 12x80s >19.8
I 83m 16x80s >18.9
Magnitudes are in the Vega system, calibrated to four APASS-DR7 stars in
the field, and have not been corrected for line-of-sight Milky Way dust
extinction, with expected E(B-V)=0.05 (Schlegel et al. 1998).
No further Skynet observations are scheduled.