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GCN Circular 17023

Subject
GRB 141022A: Skynet PROMPT-CTIO Observations
Date
2014-11-03T13:24:59Z (10 years ago)
From
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter@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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