[vsnet-grb-info 15735] GRB 141022A: Skynet PROMPT-CTIO Observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Mon Nov 3 22:25:07 JST 2014
TITLE: GCN CIRCULAR
NUMBER: 17023
SUBJECT: GRB 141022A: Skynet PROMPT-CTIO Observations
DATE: 14/11/03 13:24:59 GMT
FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter at physics.unc.edu>
A. Trotter, J. Haislip, D. Reichart, 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 141022A (Vargas et
al., GCN 16938, Swift trigger=616061) with one 24" telescope (PROMPT 8;
I band) and two 16" telescopes (PROMPT 1,5; V,I bands) of the PROMPT
array at CTIO, Chile.
Starting at 2014-10-22 01:29:40 UT and continuing until 02:50 UT
(t=2m-83m post-trigger), Skynet took a total of 126 exposures ranging
from 10s-160s each. We stacked subsets of these images to maximize the
S/N ratio, and detected no optical source in either band at the OT
position reported by GROND (Kann et al., GCN 16939). Our 3-sigma
limiting magnitudes are:
==================================
tmid scope expos fil limit
==================================
50m PROMPT1 25x160s V >21.2
50m PROMPT5 24x160s I >20.6
45m PROMPT8 46x80s I >20.3
==================================
Magnitudes are in the Vega System, calibrated to 3 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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