[vsnet-grb-info 15740] GRB 141017A: Skynet PROMPT-CTIO/SSO Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17028
SUBJECT: GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
DATE:    14/11/05 15:40:00 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 XRT localization of GRB 141017A (Marshall et 
al., GCN 16919, Swift trigger=615672) with one 24" telescope (P-CTIO 8; 
I band) and three 16" telescopes (P-CTIO 1,4,5; V,R,I bands) of the 
PROMPT array at CTIO, Chile, and with one 16" telescope (P-SSO 3; R 
band) of the PROMPT array at Siding Spring Observatory, Australia.
Starting at 2014-10-18 01:10 UT and continuing until 2014-10-20 02:26 UT 
(t=6.7h-2.3d post-trigger), Skynet took a total of 2316 exposures 
ranging from 80s-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 reported by Swift UVOT (Oates & Marshall, GCN 16924) and 
confirmed by GROND (Kann, Guelbenzu & Greiner, GCN 16926).  Our 3-sigma 
limiting magnitudes are:

==================================
tmid  scope   expos   fil  limit
==================================
7.4h  P-CTIO4 26x160s  R   >21.1
11.2h P-CTIO8 260x80s  I   >22.2
11.2h P-CTIO1 147x160s V   >22.6
11.3h P-CTIO5 143x160s I   >22.0
20.8h P-SSO3  134x160s R   >22.3
36.5h P-CTIO1 40x160s  V   >22.0
37.2h P-CTIO8 60x80s   I   >21.3
37.3h P-CTIO5 33x160s  I   >21.4
37.9h P-CTIO4 28x160s  R   >21.7
44.8h P-SSO3  133x160s R   >22.4
2.3d  P-CTIO1 30x160s  V   >21.4
2.3d  P-CTIO5 30x160s  I   >20.7
2.3d  P-CTIO8 53x80s   I   >20.5
2.3d  P-CTIO4 22x160s  R   >21.1
==================================

Magnitudes are in the Vega System, calibrated to 5 APASS stars in the 
field.  Magnitudes have not been corrected for line-of-sight Milky Way 
dust extinction, with expected E(B-V)=0.035 (Schlafly & Finkbeiner 2011).

No further Skynet observations are scheduled.