TITLE: GCN CIRCULAR NUMBER: 25340 SUBJECT: LIGO/Virgo S190814bv: MeerLICHT coverage second preliminary skymap DATE: 19/08/15 14:06:00 GMT FROM: Paul Vreeswijk at Radboud U/Nijmegen Paul Groot (Radboud/UCT/SAAO), Paul Vreeswijk (Radboud), Steven Bloemen (Radboud), Danielle Pieterse (Radboud), Lee Townsend (UCT), Rudolf Le Poole (Leiden), Patrick Woudt (UCT), Kerry Paterson (Northwestern), Vanessa McBride (OAD), Marc Klein-Wolt (Radboud), Elmar Koerding (Radboud) report on behalf of the MeerLICHT consortium: "The MeerLICHT optical wide-field telescope, located at the Sutherland station of the South African Astronomical Observatory, South Africa, covered the 95% probability-ranked area of the second preliminary skymap of S190814bv [1]. With MeerLICHT's 2.7 square degree field-of-view sampled at 0.56"/pix, a set of 24 fields covered the 95% area. Each field was observed in a set of u, q (440-720nm), i bands in one-minute exposures per filter, starting at 23:11 UT 2019-08-14, and continued throughout the night until dawn at 04:19 UT 2019-08-15. Each field was covered at least twice with a 2-hour time separation. The majority was covered a third time before dawn. Sky conditions were photometric, with a seeing around 2.5" in q-band. Limiting magnitudes (5-sigma point-source) were 18.5 mag (u), 19.7 mag (q) and 19.1 mag (i) in 60s exposures affected by full-moon conditions. Data processing is ongoing and results will be reported when they become available. Monitoring of the updated skymap [2] will continue over the coming nights." The MeerLICHT telescope [3] is designed, built and operated by the MeerLICHT consortium consisting of Radboud University, the University of Cape Town, the Univerity of Oxford, the South African Astronomical Observatory, the University of Manchester and the University of Amsterdam, with support from the Netherlands Research School for Astronomy NOVA, the Netherlands Organisation for Scientific Research NWO, the KU Leuven and the South African Radio Astronomical Observatory. References: [1] LVC Collaboration, GCN Circ. 25324 [2] LVC Collaboration, GCN Circ. 25333 [3] Bloemen et al., 2016, SPIE.9906E..64B