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Williams, Ramprasad Rao, Tanmoy Laskar, Tarraneh Eftekhari","submitted_at":"2026-04-15T18:00:21Z","abstract_excerpt":"We present the results from rapid-response 1.3 mm observations of GRB 260127A using the Submillimeter Array (SMA). SMA arrived on-source 12.6 minutes after the initial detection by the Neil Gehrels Swift Observatory, representing the earliest millimeter/submillimeter observations of a GRB to date. From these observations, we find a source with flux density $6.9\\pm1.7$ mJy, consistent with the X-ray afterglow position but slightly offset from the optical afterglow position (2.7'' offset, with the SMA detection having a 90% confidence radial position uncertainty of 0.9''). 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Subsequent observation"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"If the SMA detection is associated with GRB 260127A, we infer that the 1.3 mm light curve for GRB 260127A declined at least as fast as t^{-0.5}, suggesting that peak brightness of the event at this wavelength was reached in under a day.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The 6.9 mJy SMA source is physically associated with GRB 260127A despite the 2.7 arcsec offset from the optical afterglow position and the 0.9 arcsec radial uncertainty.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"SMA detected a 6.9 mJy source at 1.3 mm from GRB 260127A 12.6 minutes post-trigger with a 2.7 arcsec offset from the optical position; no emission was seen 1.9 days later, implying a decline at least as steep as t to the -0.5.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"SMA observations indicate the 1.3 mm afterglow of GRB 260127A declined at least as fast as t^{-0.5} if the detection is associated.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"6fac90ac54aa7f49e1c986f9e02959d0e395e2945b1c85074c16a7bfc9daebf8"},"source":{"id":"2604.14297","kind":"arxiv","version":2},"verdict":{"id":"a419bfd1-dde5-4b79-940a-799d25df0fd9","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T12:06:47.337026Z","strongest_claim":"If the SMA detection is associated with GRB 260127A, we infer that the 1.3 mm light curve for GRB 260127A declined at least as fast as t^{-0.5}, suggesting that peak brightness of the event at this wavelength was reached in under a day.","one_line_summary":"SMA detected a 6.9 mJy source at 1.3 mm from GRB 260127A 12.6 minutes post-trigger with a 2.7 arcsec offset from the optical position; 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