{"paper":{"title":"Orphan optical flare as SOSS emission afterglow, localization in time","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Chasovnikov, A. Gabovich, A. Kuznetsov, A. Tlatov, C. Francile, D. Svinkin, D. Vlasenko, E. Gorbovskoy, E. Minkina, F. Podesta, G. Antipov, K. Zhirkov, M. Serra-Ricart, N. Budnev, N. Tyurina, O. Gress, P. Balanutsa, R. Podesta, S. Simakov, S. Svertilov, V. Kornilov, V. Lipunov, V. Senik, V. Topolev, V. Yurkov, Ya. Kechin, Yu. Tselik","submitted_at":"2023-02-12T14:30:47Z","abstract_excerpt":"We report on MASTER optical observations of an afterglow-like optical and X-ray transient AT2021lfa/ZTF21aayokph. We detected the initial steady brightening of the transient at 7{\\sigma} confidence level. This allowed us to use smooth optical self-similar emission of GRBs model to constrain the explosion time to better than 14 min as well as to estimate its initial Lorentz factor {\\Gamma}0 = 20 +/- 10. Taking into consideration the low {\\Gamma}0 and non-detection in gamma-rays, we classify this transient as the first failed GRB afterglow."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2302.05924","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2302.05924/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"}