TITLE: GCN CIRCULAR NUMBER: 25015 SUBJECT: LIGO/Virgo S190701ah: GRAWITA VST-ESO PARANAL observations DATE: 19/07/07 12:01:47 GMT FROM: Aniello Grado at INAF-OAC AUTHORS: A. Grado (INAF-Napoli), E. Cappellaro (INAF-Padova), S. Yang (INAF-Padova), F. Getman (INAF-Napoli), E. Brocato (INAF-Abruzzo), G. Greco (Universita' Urbino), S. Covino (INAF-Brera), L. Izzo (IAA) on behalf of GRAWITA. We observed 45 sqdeg covering the field of S170701ah (LIGO/Virgo, B. Piotrzkowski et al., GCN #24950, updated sky localization, B. Piotrzkowski et al., GCN #24987) in r' band with the VLT Survey Telescope (VST) equipped with Omegacam (1 sqdeg FOV) (Proposal ID ESO 0103.D-0070(A)). Observations started at 08:08 UT on 2019-07-04 and ended at 10:27 on 2019-07-04. They were performed under seeing conditions between 0.49” and 0.8”, at an airmass between 1.95 and 1.27. Each pointing covering 1 sqdeg was observed twice for a total exposure time of 80 seconds. The observations, that cover ~70% of the localization probability region, were organized in group of 3x3 deg, the coordinates of the center of each group are: RA(J2000) Dec(J2000) ------------------------ 02:27:14.69 -11:58:35.5 02:25:49.35 -08:58:35.5 02:24:49.23 -05:58:35.5 02:36:53.19 -05:58:35.5 02:36:14.47 -02:58:35.5 Analysis of the images is in progress. We acknowledge excellent support from the ESO User Support Department and from ESO observing staff in Paranal.