{"paper":{"title":"GOTO identification and broadband modelling of the counterpart to the SVOM GRB 250818B","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. C. Gordon, A. Chrimes, A. E. Volvach, A. Kumar, A. Levan, A. Pozanenko, A. Sahu, A. Shein, B. Godson, B. P. Gompertz, B. Warwick, C. Liu, D. Jarvis, D. K. Galloway, D. Mata S'anchez, D. Mkrtichian, D. O'Neill, D. Pollacco, D. Steeghs, E. Stanway, G. P. Lamb, G. Ramsay, G. Schroeder, J. Casares, J. Lyman, J. McCormac, J. Mullaney, K. Ackley, K. Noysena, K. Pu, K. Ulaczyk, K. Wiersema, L. Kelsey, L. K. Nuttall, L. N. Volvach, M. E. Wortley, M. J. Dyer, M. Magee, M. Patel, M. Pursiainen, M. R. Kennedy, M. Shrestha, N. Pankov, P. Chote, P. Irawati, P. O'Brien, R. Eyles-Ferris, R. Kotak, R. P. Breton, R. Starling, S. Awiphan, S. Belkin, S. Littlefair, S. Mandhai, S. Mattila, S. McGee, S. Moran, T. Killestein, T. Laskar, U. Sawangwit, V. S. Dhillon, W.-F. Fong, Y. Julakanti, Y. Sun","submitted_at":"2026-02-18T15:59:27Z","abstract_excerpt":"Rapid localisation and follow-up of gamma-ray bursts (GRBs) increasingly rely on low-latency triggers from new missions coupled to wide-field robotic optical facilities. We present the discovery and multi-wavelength follow-up of GRB 250818B, detected by the Space Variable Objects Monitor (SVOM) and localised optically by the Gravitational-wave Optical Transient Observer (GOTO). We compile and homogenise X-ray, optical/NIR, and radio data to build broadband light curves and spectral energy distributions. The afterglow is unusually luminous for a nominal short GRB, lying on the bright end of the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2602.16559","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2602.16559/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}