{"paper":{"title":"The optical counterpart to gamma-ray burst GRB970228 observed using the Hubble Space Telescope","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Charles A. Meegan (NASA/MSFC), Chryssa Kouveliotou (NASA/MSFC), F. Duccio Macchetto (STScI), Gerald J. Fishman (NASA/MSFC), Jan van Paradijs (U. Amsterdam & U. Alabama), Kailash C. Sahu (STScI), Larry Petro (STScI), Mario Livio (STScI), Paul J. Groot (U. Amsterdam), Titus Galama (U. Amsterdam)","submitted_at":"1997-05-22T21:35:53Z","abstract_excerpt":"Although more than 2,000 astronomical gamma-ray bursts (GRBs) have been detected, and numerous models proposed to explain their occurrence, they have remained enigmatic owing to the lack of an obvious counterpart at other wavelengths. The recent ground-based detection of a transient source in the vicinity of GRB 970228 may therefore have provided a breakthrough. The optical counterpart appears to be embedded in an extended source which, if a galaxy as has been suggested, would lend weight to those models that place GRBs at cosmological distances. Here we report the observations using the Hubbl"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9705184","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":""},"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"}