GCN Circular 17028
Subject
GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
Date
2014-11-05T15:40:00Z (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 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.