RECORD
Persistent Counterparts to GRBS
Astrophysics · Submitted 15 Jun 1997
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The spectrum of GRB970508 is not consistent with an external shock origin for both the prompt GRB and the persistent emission, suggesting that at least the prompt radiation is produced by internal shocks.
The compiled record
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
Open the compiled record
The abstract, sentence by sentence
The recent discovery of persistent GRB counterparts at lower frequencies permits several important conclusions to be drawn. The spectrum of GRB970508 is not consistent with an external shock origin for both the prompt GRB and the persistent emission, suggesting that at least the prompt radiation is produced by internal shocks. Comparisons among three GRB with counterparts (or upper limits on them) establishes that GRB are not all scaled versions of similar events. The angular size inferred from the apparent observation of self-absorption in the radio spectrum of GRB970508 a week later implies that its expansion had slowed to semi-relativistic speeds. This permits a remarkably low upper bound to be placed on its residual energy, suggesting either that radiation has been $> 99.7%$ efficient or that the initial outflow was strongly collimated. Observations of self-absorbed radio emission from future GRB may permit direct measurement of their expansion and determination of their parameters and energetics. We estimate initial Lorentz factors for GRB970228 and GRB970508 $\gamma_0 \sim 100$, and present a solution for the evolution of a blast wave with instantaneous cooling. The visible flux is predicted to rise initially as a power of $t$ slightly less than unity, in agreement with observations of GRB970508.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The recent discovery of persistent GRB counterparts at lower frequencies permits several important conclusions to be drawn. | background 0.74 | 0.10 | 0.12 | hedged possibility 0.62 |
| s1 | The spectrum of GRB970508 is not consistent with an external shock origin for both the prompt GRB and the persistent emission, suggesting that at least the prompt radiation is produced by internal shocks. | interpretation 0.65 | 0.61 | 0.23 | hedged possibility 0.76 |
| s2 | Comparisons among three GRB with counterparts (or upper limits on them) establishes that GRB are not all scaled versions of similar events. | result 0.84 | 0.80 | 0.19 | asserted 1.00 |
| s3 | The angular size inferred from the apparent observation of self-absorption in the radio spectrum of GRB970508 a week later implies that its expansion had slowed to semi-relativistic speeds. | result 0.76 | 0.74 | 0.09 | hedged possibility 0.54 |
| s4 | This permits a remarkably low upper bound to be placed on its residual energy, suggesting either that radiation has been $> 99.7%$ efficient or that the initial outflow was strongly collimated. | interpretation 0.91 | 0.85 | 0.18 | hedged possibility 0.77 |
| s5 | Observations of self-absorbed radio emission from future GRB may permit direct measurement of their expansion and determination of their parameters and energetics. | future work 0.98 | 0.09 | 0.14 | hedged possibility 1.00 |
| s6 | We estimate initial Lorentz factors for GRB970228 and GRB970508 $\gamma_0 \sim 100$, and present a solution for the evolution of a blast wave with instantaneous cooling. | result 0.54 | 0.95 | 0.09 | asserted 0.99 |
| s7 | The visible flux is predicted to rise initially as a power of $t$ slightly less than unity, in agreement with observations of GRB970508. | result 0.94 | 0.83 | 0.08 | asserted 0.83 |
What was examined, and what was not
- arXiv listing abstract v2
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
The paper
Original abstract
The recent discovery of persistent GRB counterparts at lower frequencies permits several important conclusions to be drawn. The spectrum of GRB970508 is not consistent with an external shock origin for both the prompt GRB and the persistent emission, suggesting that at least the prompt radiation is produced by internal shocks. Comparisons among three GRB with counterparts (or upper limits on them) establishes that GRB are not all scaled versions of similar events. The angular size inferred from the apparent observation of self-absorption in the radio spectrum of GRB970508 a week later implies that its expansion had slowed to semi-relativistic speeds. This permits a remarkably low upper bound to be placed on its residual energy, suggesting either that radiation has been $> 99.7%$ efficient or that the initial outflow was strongly collimated. Observations of self-absorbed radio emission from future GRB may permit direct measurement of their expansion and determination of their parameters and energetics. We estimate initial Lorentz factors for GRB970228 and GRB970508 $\gamma_0 \sim 100$, and present a solution for the evolution of a blast wave with instantaneous cooling. The visible flux is predicted to rise initially as a power of $t$ slightly less than unity, in agreement with observations of GRB970508.
Human review
References
Discussion
Know something about this paper? Leave a comment, or highlight any passage above to comment on it.