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GRB990123, The Optical Flash and The Fireball Model

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arxiv astro-ph/9902009 v1 pith:NKSTHEV6 submitted 1999-02-02 astro-ph

Re'em Sari (CALTECH) , Tsvi Piran (Hebrew University , Columbia University) This is my paper · ORCID
classification astro-ph
keywords observationsgrb990123opticalshockafterglowejectaemissionflash
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abstract

We compare the ongoing observations of the remarkable burst GRB990123, the mother of all bursts, with the predictions of the afterglow theory. We show that the observations agree with the recent prediction that a reverse shock propagating into the ejecta would produce a very strong prompt optical flash. This reverse shock has also produced the 8.46GHz radio signal, observed after one day. The forward shock, which propagates into the ISM is the origin of the classical afterglow. It has produced the prompt X-ray signal as well as the late optical and IR emission. It would most likely produce a radio emission within the next few weeks. The observations suggest that the initial Lorentz factor of the ejecta was $\sim 200$. Within factors of order unity, this crude model explains all current observations of GRB990123.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Systematic Error in Approximate Models of the GRB Early Afterglow

    astro-ph.HE 2026-06 unverdicted novelty 6.0 of 10

    High-resolution simulations demonstrate that two-zone models for GRB early afterglows fail to match hydrodynamic evolution in the Newtonian reverse shock regime before Blandford-McKee self-similarity, causing systemat...

  2. Early Optical Follow-up of Gamma-Ray Bursts: The Critical Role of Robotic Telescopes

    astro-ph.HE 2026-06 unverdicted novelty 2.0 of 10

    A review of early optical GRB features including prompt emission, reverse shocks, and afterglow onset, highlighting robotic telescopes' role in constraining jet Lorentz factors and magnetization.

  3. Gamma-ray bursts: what do we know today that we did not know 10 years ago?

    astro-ph.HE 2024-12 unverdicted

    A review of the past decade of gamma-ray burst research, highlighting structured jets, GR-MHD simulations, TeV detections, and the contested idea that many GRBs have moderate Lorentz factors.

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