TITLE:   GCN CIRCULAR
NUMBER:  21598
SUBJECT: LIGO/VIRGO G298048: INAF VST-ESO PARANAL observations
DATE:    17/08/19 17:37:19 GMT
FROM:    Aniello Grado at INAF-OAC  <aniello.grado@gmail.com>

A. Grado (INAF-OAC), E. Cappellaro (INAF-OAPD), G. Greco (Urbino
University/INFN Firenze), M. Branchesi (GSSI), S. Covino
(INAF-OAB), P. D'Avanzo (INAF-OAB), F. Getman (INAF-OAC), A. Melandri
(INAF-OAB), L. Amati
(INAF-IASF Bo), L. A. Antonelli, (INAF-OAR), S. Ascenzi (INAF-OAR), S.
Benetti (INAF-OAPD), M.T. Botticella (INAF-OAC),  S. Campana (INAF-OAB), V.
D'Elia (INAF-ASDC), D. Fugazza, L. Limatola (INAF-OAC), M. Lisi (INAF-OAR),
L. Nicastro (INAF-IASF Bo), E. Palazzi (INAF-IAFS Bo), E. Pian (SNS-Pisa),
S. Piranomonte (INAF-OAR), L. Pulone (INAF-OAR), A. Rossi (INAF-IASF Bo), P.
Schipani (INAF-OAC), G. Stratta (Urbino University/INFN Firenze), G.
Tagliaferri (INAF-OAB), V. Testa (INAF-OAR), L . Tomasella (INAF-OAPD), S.
Yang (INAF-OAPD), E. Brocato (INAF-OAR) on behalf of GRavitational Wave
Inaf TeAm report:


Observations of 9 square degrees of the skymap of the Advanced LIGO and
Virgo trigger G298048 (LVC GCN Circ. 21509, 21513) were performed with the
VLT
Survey Telescope (VST - Proposal ID ESO 099.D-0191) at ESO-Paranal equipped
with OMEGACAM (FOV=1 square degree). The observation of the 3 x 3 square
degrees region
is centered on the following  coordinates:

RA, Dec (ICRSd):

194.30420 -17.85690

The VST pointings was generated using the GWsky script (
https://github.com/ggreco77/GWsky). Starting from the high probability
region of the skymap, the sequence was defined to maximize the contained
localization probability.
The images were taken in the r_SDSS filter with an exposure of 80s (split
in two dithered exposures of 40 s each). The observations started at
2017-08-17T 23:44:50.964 UTC and finished at 2017-08-18T 00:08:46.388.
Automatic data reduction with the VSTTube pipeline (Grado et al. 2012
Mem.SAIt 19, 362 ) was completed. The image analysis is ongoing.