{"paper":{"title":"GRAWITA: VLT Survey Telescope observations of the gravitational wave sources GW150914 and GW151226","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Bulgarelli, A. Grado, A. Melandri, A. Possenti, A. Rossi, A. Stamerra, B. Patricelli, E. Brocato, E. Cappellaro, E. Palazzi, E. Pian, F. Getman, F. Longo, G. Cella, G. De Cesare, G. Ghirlanda, G. Ghisellini, G. Giuffrida, G. Greco, G. Iannicola, G. Israel, G. Stratta, G. Tagliaferri, L. A. Antonelli, L. Amati, L. Limatola, L. Nicastro, L. Pulone, L. Stella, L. Tomasella, M. Branchesi, M. Capaccioli, M. Dadina, M. Lisi, M. Mapelli, M. Radovich, M. Razzano, M. Spera, N. Masetti, P. D'Avanzo, P. Marrese, P. Schipani, R. Salvaterra, S. Ascenzi, S. Benetti, S. Campana, S. Covino, S. Marinoni, S. Piranomonte, S. Yang, V. D'Elia, V. Testa","submitted_at":"2017-10-16T06:00:21Z","abstract_excerpt":"We report the results of deep optical follow-up surveys of the first two gravitational-wave sources, GW150914 and GW151226, done by the GRAvitational Wave Inaf TeAm Collaboration (GRAWITA). The VLT Survey Telescope (VST) responded promptly to the gravitational-wave alerts sent by the LIGO and Virgo Collaborations, monitoring a region of $90$ deg$^2$ and $72$ deg$^2$ for GW150914 and GW151226, respectively, and repeated the observations over nearly two months. Both surveys reached an average limiting magnitude of about 21 in the $r-$band. The paper describes the VST observational strategy and t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.05915","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}