Radio Monitoring of the January 11, 1997 Gamma-Ray Burst

Details Radio Monitoring of the January 11, 1997 Gamma-Ray Burst Radio Monitoring of the January 11, 1997 Gamma-Ray Burst

1997-04-17

arxiv.org/abs/astro-ph/9704180v1

Astronomy and Astrophysics

Astrophysics

ApJ Let (accepted)

Scientific paper

10.1086/310753

We report on a comprehensive radio monitoring program of the bright gamma-ray burster GRB970111. These VLA observations were made at a frequency of 1.4 GHz and span a range of post-burst timescales between 28 hours and one month. Despite extensive sampling at sub-milliJansky sensitivities, no radio source was detected above 0.5 mJy in the current best error box (~14 arcmin^2) for GRB970111. A highly unusual radio source, VLA J1528.7+1945, was seen to drop in flux density by a factor of two in our monitoring period but it lies outside the error box and thus it is unlikely to be related to GRB970111. 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 GRB970111 provides strong constraints on these models.

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