TITLE:   GCN CIRCULAR
NUMBER:  18842
SUBJECT: LIGO/Virgo G211117: VISTA imaging
DATE:    16/01/08 10:57:23 GMT
FROM:    Nial Tanvir at U of Leicester  <nrt3@le.ac.uk>

N. R. Tanvir, K. Wiersema, P. T. O'Brien, J. Osborne,
P. Evans (U. Leicester), A. J. Levan, D. Steeghs, J. Lyman (U. Warwick),
J. Fynbo, D. Malesani, J. Hjorth, D. Perley, B. Milvang-Jensen,
D. Watson (DARK/NBI), S. Fairhurst, P. Sutton (U. Cardiff),
I. Mandel (U. Birmingham), M. Irwin, C. Gonzalez-Fernandez,
R. McMahon,  E. Gonzalez-Solares (U. Cambridge), E. Pian (SNS-Pisa), 
E. Palazzi (INAF-IAFS Bo), D. White (U. Edinburgh), S. Schulze (PUC, MAS), 
Z. Cano (U. Iceland), A. de Ugarte-Postigo, C. Thoene (IAA-CSIC)
report:

We initiated a sequence of near-infrared imaging observations 
with the 4m ESO VISTA telescope at Cerro Paranal, Chile,
to map the same northern part of the reported
error region that was surveyed by VST (Grado et al.
GCN 18734). Specifically the field centres of our
sub-regions are:

02:29:55.20 +16:13:12
02:38:02.21 +19:13:12
02:46:35.71 +22:12:34
02:59:40.80 +25:13:12
03:06:55.13 +28:13:12
03:18:23.71 +31:13:12

and each sub-region is tiled to cover roughly 3x3 degrees.
We are observing in the Y, J and Ks bands, with each pixel
exposed for 60s. The observations began on 1 Jan 2016, 
but will take several more nights to complete given the short 
visibility of the fields.