1997/04/17 by D. A. Frail, S. R. Kulkarni, E. Costa +8
Physics and Astronomy · #Astro and Planetary Science #Gamma-ray bursts and supernovae #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1086/310753
ApJ Let (accepted)
arxiv created 1997/04/17 · openalex publication_date 1997/07/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We report on a comprehensive radio monitoring program of the bright gamma-ray burster GRB 970111. These VLA observations were made at a frequency of 1.4 GHz (λ = 20 cm) and span a range of postburst timescales between 28 hr and 1 month. Despite extensive sampling at submillijansky sensitivities, no radio source was detected above 0.5 mJy in the current best error box (~14 arcmin 2 ) for GRB 970111. A highly unusual radio source, VLA J1528.7+1945, was seen to drop in flux density by a factor of 2 in our monitoring period, but it lies outside the error box, and thus it is unlikely to be related to GRB 970111. Cosmological fireball models of gamma-ray bursts make predictions of late-time emission occurring at longer wavelengths. The absence of a flaring or fading radio counterpart to GRB 970111 provides strong constraints on these models.