TITLE: GCN CIRCULAR NUMBER: 22368 SUBJECT: LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo DATE: 18/01/24 08:46:57 GMT FROM: Aniello Grado at INAF-OAC A. Grado (INAF-OAC), E. Cappellaro (INAF-OAPD), F. Getman (INAF-OAC), L. Limatola (INAF-OAC), S. Yang (INAF-OAPD), M. Branchesi (GSSI), S. Covino (INAF-OAB), P. D'Avanzo (INAF-OAB), M. Della Valle (INAF-OAC), A. Melandri (INAF-OAB), L. Amati (INAF-OAS), S. Ascenzi (INAF-OAR), S. Benetti (INAF-OAPD), M.T. Botticella (INAF-OAC), G. Greco (Urbino University/INFN Firenze), L. Nicastro (INAF-OAS), E. Palazzi (INAF-OAS), E. Pian (INAF-OAS), S. Piranomonte (INAF-OAR), A. Rossi (INAF-OAS), G. Stratta (Urbino University/INFN Firenze), G. Tagliaferri (INAF-OAB), L . Tomasella (INAF-OAPD), E. Brocato (INAF-OAR) on behalf of GRavitational Wave Inaf TeAm. Observations pointed at the position of AT2017gfo of the skymap of the Advanced LIGO and Virgo trigger G298048 (LVC GCN Circ. 21509, 21513) using the VLT Survey Telescope (VST - Proposal ID ESO 0100.D-0022) at ESO-Paranal equipped with OMEGACAM (FOV=1 square degree). The images were acquired with the g_SDSS, r_SDSS, filters for a total exposure of 5400s in each band. The observations were executed in the nights 2018-01-05, 2018-01-18 and 2018-01-19, starting at 2018-01-05T 06:57:00.057 UTC and finishing at 2018-01-19T 06:55:22.862 UTC. The median FWHM and the 50% completeness magnitudes are 0.91", 0.92" and 25.0 and 24.5 AB mags for the g_ssds and r_sdss bands respectively. No source is visible at the GW optical counterpart coordinates RA=13:09:48.09 DEC=-23:22:53.35. We acknowledge excellent support from the ESO User Support Department and from ESO observing staff in Paranal.